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extra : rebase_source : d0e52d3a06b2734287cc30fe9ef9ebd0a641b05a

git show-ref -s HEAD  has shown to not work in all scenarios
and git rev-parse --help provides this as an ultimate example:

         ·   Print the object name of the current commit:

               $ git rev-parse --verify HEAD

Add Cython.Compiler.Importer to import code which relies on functionality that is not portable across python versions

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extra : transplant_source : J%FF%93%9C%96%02%E8m%0E%AD7V%A5%1C%CF%7D%89%F6%14J

As it doesn't have builtin sets.

reduce code size of parser and speed it up a little by statically switching to unicode in more places

Made the distutils extension 2.3 compatible
Renamed the --debug flag to --gdb and --pyrex-debug to --pyrex-gdb

setup.py option '--cython-compile-all' to compile more Cython modules during installation than enabled by default