Add # -lm comment to modules that need it as sharedlib.

Minor lay-out changes.

doesn't hurt elsewhere.

- mwerks_nonshared_config.h for standalone pythons
- mwerks_shared_config.h for shared pythons (PythonCore, app and
  applet)
- mwerks_plugin_config.h for plugins
Only the _tkinter plugin uses a customized header.

Old config files have gone to the "old" directory, for the time being.

- Created CFM68K projects (not all tested yet!!)
- Moved quicktime to its own module
- Modified the README file to (approximately) resemble reality

- Moved Qt and Cm out of toolbox into private library (so people
  without QuickTime can install PPC Python)

- support for SCO_SV dynamic loading
- on Mac, auto-detect dynamic loading by __CFM68K__ or _powerc)
- on Mac, long shared library extension is .cfm68k.slb or .ppc.slb
- on hp, don't redefine hpux if already defined
- add __file__ property to successfully loaded module

from marshal_loads()).

to work as hard (but "stringizing" is still used, so we test the newly
introduced HAVE_OLD_CPP config define).