Improve .gitignore grouping and documentation
diff --git a/.gitignore b/.gitignore
index 16fa70d..e135143 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,8 +1,17 @@
+# CMake build artifacts:
 CMakeCache.txt
 CMakeFiles
 CTestTestfile.cmake
 cmake_install.cmake
 Testing
+# CMake generates *.dir/ folders for in-tree builds (used by MSVC projects), ignore all of those:
+*.dir/
+# MSVC files generated by CMake:
+/*.sln
+/*.vcxproj
+/*.filters
+
+# Test coverage build artifacts:
 Coverage
 *.gcno
 *.gcda
@@ -10,19 +19,15 @@
 # generated by scripts/memory.sh
 massif-*
 
-# MSVC files generated by CMake:
-/*.sln
-/*.vcxproj
-/*.filters
-
 # MSVC build artifacts:
 *.exe
 *.pdb
 *.ilk
 *.lib
 
-# CMake generates *.dir/ folders for in-tree builds (used by MSVC projects), ignore all of those:
-*.dir/
+# Python build artifacts:
+*.pyc
+
 
 # Editor navigation files:
 /GPATH