in importdl.c (I had just one crash too many with a static python
  importing a dynamic module)
- On powerpc, enable USE_CACHE_ALIGNED with a linesize of 32 bytes.

- 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.

both enabled with USE_SHARED_LIBRARY, now there's also
USE_MAC_DYNAMIC_LOADING).

Added a few other USE_ defines for optional modules to nonshared
config (they're not included in the base shared library)

whether there is shared library support. Libraries, applets and
applications are distinguished by the sources they include.