Renamed and, or to and_, or_.
Renamed all internal identifiers so as not to start with '__' (which is
a compiler privilege); remove AIX hack.

Use keyword arg to set verbose flag in test func.

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.