Add documentation of regex module.
Add documentation of the sequence module.
Add toolset_requirements.py to the test suite.
Fix error message.
Add another file to .gitignore.
Fix bug in pathnt.c that caused the results of GLOB to be downcased under some circumstances.
prebuilt.py needs to treat clang-darwin the same way as darwin.
Attempt to fix source_order.py on Windows.
cxxflags should not apply to C files.  Fixes #9815.
Merge branch 'develop'