* Base address for all extension modules updated. PC\dllbase_nt.txt
also updated.  Erroneous "libpath" directory removed for all
projects.

* winsound module moved from a builtin module to an extension
module.  This was done primarily to avoid Python16.dll needing to
pull in winmm.dll.  Really dumb test added for winsound - but if
nothing else it ensures the module imports.

added notes to readme.txt about NumPy targets;
added some symbols to python_nt.def.