The change is only relevant to development as all the call to python scripts is done
calling C++ os::python that invoques the appropriate python version.
The change is two fold, on one hand remove all the uses of /usr/bin/env for python.
On the other hand rename all the calls to python from python to python3 making it explicit
and being compliant with PEP 394 -- The "python" Command on Unix-Like Systems:
https://www.python.org/dev/peps/pep-0394/
Remove the sheebang from src/graphics/GraphicsConverter.cpp because it is not necessary.
Some small whitespace changes.
Let srcipt work under Python2 and Python3,
also if the locale is not set to utf8.
Patch from Günter Milde, sort of cherry-pick from 9086db662d47e1b4be93551ccfefa8c1090e040b
2.) Read the PATCH_VERSION from configure.ac too
3.) Ident-text in script
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@38804 a592a061-630c-0410-9148-cb99ea01b6c8
