- Rewrote bootstapping code in sh so we're really independent of an

installed Python. So we don't use os.execve any longer, which means
we need an actual executable in <myapp>.app/Contents/MacOS. For applets
we make a symlink to the Python executable used to build the applet,
for standalone apps we simply copy it.
- Added support for the new any_missing_maybe() feature of modulefinder.py,
which is pending as patch #643711. Its use is optional so it still works
with the existing version of modulefinder.py