clean up use of const with UsefulBuf. May solve compiler errors/warnings for some compilers / compiler options
diff --git a/test/UsefulBuf_Tests.c b/test/UsefulBuf_Tests.c
index fc99ee6..82f2da6 100644
--- a/test/UsefulBuf_Tests.c
+++ b/test/UsefulBuf_Tests.c
@@ -335,7 +335,7 @@
       return "IsNULLOrEmpty failed";
    }
    
-   UsefulBufC UBC = UsefulBuf_Const(UB);
+   const UsefulBufC UBC = UsefulBuf_Const(UB);
    
    if(!UsefulBuf_IsNULLC(UBC)){
       return "IsNull const failed";
@@ -349,7 +349,7 @@
       return "IsNULLOrEmptyC failed";
    }
    
-   UsefulBuf UB2 = UsefulBuf_Unconst(UBC);
+   const UsefulBuf UB2 = UsefulBuf_Unconst(UBC);
    if(!UsefulBuf_IsEmpty(UB2)) {
       return "Back to UB is Empty failed";
    }
@@ -371,7 +371,7 @@
    
    // Set 100 bytes of '+'; validated a few tests later
    UsefulBuf_MAKE_STACK_UB(Temp, 100);
-   UsefulBufC TempC = UsefulBuf_Set(Temp, '+');
+   const UsefulBufC TempC = UsefulBuf_Set(Temp, '+');
    
    // Try to copy into a buf that is too small and see failure
    UsefulBuf_MAKE_STACK_UB(Temp2, 99);
@@ -409,7 +409,7 @@
    }
    
    // Try to copy into a NULL/empty buf and see failure
-   UsefulBuf UBNull = NULLUsefulBuf;
+   const UsefulBuf UBNull = NULLUsefulBuf;
    if(!UsefulBuf_IsNULLC(UsefulBuf_Copy(UBNull, TempC))) {
       return "Copy to NULL should have failed";
    }
@@ -465,7 +465,7 @@
       '+',  '+',  '+',  '+', '+',  '+',  '+', '+',  '+',  '+',
       '+',  '+',  '+',  '+', '+',  '+',  '+', '+',  '+',  ',',
    };
-   UsefulBufC ExpectedBigger = UsefulBuf_FROM_BYTE_ARRAY_LITERAL(pExpectedBigger);
+   const UsefulBufC ExpectedBigger = UsefulBuf_FROM_BYTE_ARRAY_LITERAL(pExpectedBigger);
    
    // Expect -1 when the first arg is smaller
    if(UsefulBuf_Compare(Expected, ExpectedBigger) >= 0){
@@ -485,7 +485,7 @@
       '+',  '+',  '+',  '+', '+',  '+',  '+', '+',  '+',  '+',
       '+',  '+',  '+',  '+', '+',  '+',  '+', '+',  '+',  '*',
    };
-   UsefulBufC ExpectedSmaller = UsefulBuf_FROM_BYTE_ARRAY_LITERAL(pExpectedSmaller);
+   const UsefulBufC ExpectedSmaller = UsefulBuf_FROM_BYTE_ARRAY_LITERAL(pExpectedSmaller);
    // Expect +1 when the first arg is larger
    if(UsefulBuf_Compare(Expected, ExpectedSmaller) <= 0){
       return "Compare with smaller";
@@ -504,7 +504,7 @@
       '+',  '+',  '+',  '+', '+',  '+',  '+', '+',  '+',  '+',
       '+',  '+',  '+',  '+', '+',  '+',  '+', '+',  '+',  '+', '+'
    };
-   UsefulBufC ExpectedLonger = UsefulBuf_FROM_BYTE_ARRAY_LITERAL(pExpectedLonger);
+   const UsefulBufC ExpectedLonger = UsefulBuf_FROM_BYTE_ARRAY_LITERAL(pExpectedLonger);
    
    // Expect -1 when the first arg is smaller
    if(UsefulBuf_Compare(Expected, ExpectedLonger) >= 0){
@@ -524,7 +524,7 @@
       '+',  '+',  '+',  '+', '+',  '+',  '+', '+',  '+',  '+',
       '+',  '+',  '+',  '+', '+',  '+',  '+', '+',  '+',
    };
-   UsefulBufC ExpectedShorter = UsefulBuf_FROM_BYTE_ARRAY_LITERAL(pExpectedShorter);
+   const UsefulBufC ExpectedShorter = UsefulBuf_FROM_BYTE_ARRAY_LITERAL(pExpectedShorter);
    // Expect +1 with the first arg is larger
    if(UsefulBuf_Compare(Expected, ExpectedShorter) <= 0){
       return "Compare with shorter";
@@ -542,7 +542,7 @@
    
    // look for ++* in ....++* and find it at the end
    static const uint8_t pToFind[] = {'+', '+', '*'};
-   UsefulBufC ToBeFound = UsefulBuf_FROM_BYTE_ARRAY_LITERAL(pToFind);
+   const UsefulBufC ToBeFound = UsefulBuf_FROM_BYTE_ARRAY_LITERAL(pToFind);
    
    if(97 != UsefulBuf_FindBytes(ExpectedSmaller, ToBeFound)){
       return "Failed to find 2";
@@ -581,7 +581,7 @@
    UsefulOutBuf_AppendFloat(&UOB, f); // Also tests UsefulOutBuf_InsertFloat
    UsefulOutBuf_AppendDouble(&UOB, d); // Also tests UsefulOutBuf_InsertDouble
    
-   UsefulBufC O = UsefulOutBuf_OutUBuf(&UOB);
+   const UsefulBufC O = UsefulOutBuf_OutUBuf(&UOB);
    if(UsefulBuf_IsNULLC(O))
       return "Couldn't output integers";
    
@@ -621,7 +621,7 @@
    // Reset and go again for a few more tests
    UsefulInputBuf_Init(&UIB, O);
    
-   UsefulBufC Four = UsefulInputBuf_GetUsefulBuf(&UIB, 4);
+   const UsefulBufC Four = UsefulInputBuf_GetUsefulBuf(&UIB, 4);
    if(UsefulBuf_IsNULLC(Four)) {
       return "Four is NULL";
    }
diff --git a/test/qcbor_decode_malloc_tests.c b/test/qcbor_decode_malloc_tests.c
index ea6be04..ea184b5 100644
--- a/test/qcbor_decode_malloc_tests.c
+++ b/test/qcbor_decode_malloc_tests.c
@@ -66,7 +66,7 @@
     
     // Next parse, save pointers to a few strings, destroy original and see all is OK.
     UsefulBuf_MAKE_STACK_UB(CopyOfStorage, 160);
-    UsefulBufC CopyOf = UsefulBuf_Copy(CopyOfStorage, UsefulBuf_FROM_BYTE_ARRAY_LITERAL(pValidMapEncoded));
+    const UsefulBufC CopyOf = UsefulBuf_Copy(CopyOfStorage, UsefulBuf_FROM_BYTE_ARRAY_LITERAL(pValidMapEncoded));
     
     QCBORDecode_Init(&DC, CopyOf, QCBOR_DECODE_MODE_NORMAL);
     QCBORStringAllocator *pAlloc = QCBORDecode_MakeMallocStringAllocator();
diff --git a/test/qcbor_decode_tests.c b/test/qcbor_decode_tests.c
index 08cf947..6c201e8 100644
--- a/test/qcbor_decode_tests.c
+++ b/test/qcbor_decode_tests.c
@@ -1422,7 +1422,7 @@
       QCBORItem Item;
       int nCBORError;
       
-      UsefulBufC Input = {pBuf, nLen+1};
+      const UsefulBufC Input = {pBuf, nLen+1};
       
       QCBORDecode_Init(&DCtx, Input, QCBOR_DECODE_MODE_NORMAL);
       
@@ -2197,7 +2197,7 @@
    UsefulBuf_MAKE_STACK_UB(Storage, 50);
    int i;
    for(i=1; i < QCBOR_MAX_ARRAY_NESTING+4; i++) { 
-      UsefulBufC Nested = make_nested_indefinite_arrays(i, Storage);
+      const UsefulBufC Nested = make_nested_indefinite_arrays(i, Storage);
       int nReturn = parse_indeflen_nested(Nested, i);
       if(nReturn) {
          return nReturn;
@@ -2561,7 +2561,7 @@
    
    // ----- Mempool is way too small -----
    UsefulBuf_MAKE_STACK_UB(BigIndefBStrStorage, 290);
-   UsefulBufC BigIndefBStr = MakeIndefiniteBigBstr(BigIndefBStrStorage);
+   const UsefulBufC BigIndefBStr = MakeIndefiniteBigBstr(BigIndefBStrStorage);
    
    UsefulBuf_MAKE_STACK_UB(MemPoolSmall, 80); // 80 is big enough for MemPool overhead, but not BigIndefBStr
    
@@ -2651,7 +2651,7 @@
    
    // Next parse, save pointers to a few strings, destroy original and see all is OK.
    UsefulBuf_MAKE_STACK_UB(CopyOfStorage, 160);
-   UsefulBufC CopyOf = UsefulBuf_Copy(CopyOfStorage, UsefulBuf_FROM_BYTE_ARRAY_LITERAL(pValidMapEncoded));
+   const UsefulBufC CopyOf = UsefulBuf_Copy(CopyOfStorage, UsefulBuf_FROM_BYTE_ARRAY_LITERAL(pValidMapEncoded));
 
    QCBORDecode_Init(&DC, CopyOf, QCBOR_DECODE_MODE_NORMAL);
    QCBORDecode_SetMemPool(&DC, Pool, 1); // Turn on copying.
diff --git a/test/qcbor_encode_tests.c b/test/qcbor_encode_tests.c
index dd56791..97cee3d 100644
--- a/test/qcbor_encode_tests.c
+++ b/test/qcbor_encode_tests.c
@@ -609,7 +609,7 @@
    
    // UUIDs
    static const uint8_t ppppUUID[] = {0x53, 0x4D, 0x41, 0x52, 0x54, 0x43, 0x53, 0x4C, 0x54, 0x54, 0x43, 0x46, 0x49, 0x43, 0x41, 0x32};
-   UsefulBufC XXUUID = UsefulBuf_FROM_BYTE_ARRAY_LITERAL(ppppUUID);
+   const UsefulBufC XXUUID = UsefulBuf_FROM_BYTE_ARRAY_LITERAL(ppppUUID);
    QCBOREncode_AddBinaryUUID(&ECtx, XXUUID);
    QCBOREncode_OpenMap(&ECtx);
    QCBOREncode_AddBinaryUUIDToMap(&ECtx, "UUUU", XXUUID);
@@ -626,7 +626,7 @@
 
 
    static const uint8_t pBignum[] = {0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
-   UsefulBufC BIGNUM = UsefulBuf_FROM_BYTE_ARRAY_LITERAL(pBignum);
+   const UsefulBufC BIGNUM = UsefulBuf_FROM_BYTE_ARRAY_LITERAL(pBignum);
    QCBOREncode_AddPositiveBignum(&ECtx, BIGNUM);
    QCBOREncode_AddNegativeBignum(&ECtx, BIGNUM);
    QCBOREncode_OpenMap(&ECtx);
@@ -1286,7 +1286,7 @@
 
          // Add a few fake integers and buffers for now.
          static const uint8_t pPV[] = {0x66, 0x67, 0x00, 0x56, 0xaa, 0xbb, 0x01, 0x01};
-         UsefulBufC WSPV = {pPV, sizeof(pPV)};
+         const UsefulBufC WSPV = {pPV, sizeof(pPV)};
             
          QCBOREncode_AddBytesToMap(&ECtx, "WhaleSharkPatternVector", WSPV);
       }
@@ -1354,7 +1354,7 @@
 
 int RTICResultsTest()
 {
-   UsefulBufC Encoded = FormatRTICResults(CBOR_SIMPLEV_FALSE, 1477263730,
+   const UsefulBufC Encoded = FormatRTICResults(CBOR_SIMPLEV_FALSE, 1477263730,
                                           "recent", "0xA1eC5001",
                                           UsefulBuf_FROM_BYTE_ARRAY(spBigBuf));
    if(UsefulBuf_IsNULLC(Encoded)) {
@@ -1793,16 +1793,16 @@
 {
    // All of this is from RFC 8152 C.2.1
    const char *szKid = "11";
-   UsefulBufC Kid = UsefulBuf_FromSZ(szKid);
+   const UsefulBufC Kid = UsefulBuf_FromSZ(szKid);
    const char *szPayload = "This is the content.";
-   UsefulBufC Payload = UsefulBuf_FromSZ(szPayload);
+   const UsefulBufC Payload = UsefulBuf_FromSZ(szPayload);
    static const uint8_t pProtectedHeaders[] = {0xa1, 0x01, 0x26};
-   UsefulBufC ProtectedHeaders = UsefulBuf_FROM_BYTE_ARRAY_LITERAL(pProtectedHeaders);
+   const UsefulBufC ProtectedHeaders = UsefulBuf_FROM_BYTE_ARRAY_LITERAL(pProtectedHeaders);
 
    // It would be good to compare this to the output from
    // a COSE implementation like COSE-C. It has been checked
    // against the CBOR playground.
-   UsefulBufC Signature = UsefulBuf_FROM_BYTE_ARRAY_LITERAL(spSignature);
+   const UsefulBufC Signature = UsefulBuf_FROM_BYTE_ARRAY_LITERAL(spSignature);
    
    QCBOREncodeContext EC;
    QCBOREncode_Init(&EC, UsefulBuf_FROM_BYTE_ARRAY(spBigBuf));