osx: the debugger itself wants to use python. This gets interesting
     when fontforge comes with it's own python. So this removes the local
     python and forces off loading python init files (the tools menu)
     so the main fontforge.c app runs ok. If we want to do debugging
     of python stuff too then this will be much more complicated.
Merge pull request #1191 from monkeyiq/2014feb/osxdebugupdate

osx: the debugger itself wants to use python.