Change the output names. Do away with the Release and Debug

Change the output names.  Do away with the Release and Debug
subdirectories.

All final products go into the current directory (i.e., PCbuild).

Object files go into temp-release and temp-debug.

Debug versions of DLLs have _d appended to their basename, e.g. the
debug version of python15.dll is python15_d.dll, the debug version of
python.exe is python_d.exe, and the debug version of parser.pyd is
parser_d.pyd.  (See corresponding patch to importdl.c.)  Uniformly
changed all extension modules to use .pyd, not .dll.