Changes to MemMgr distribution for release 1.03.

Now configured with WRPRC2 imake configuration files.


Most important code change:
All functions are #define'd as "# define f f_" in memmgr.h.  This
causes failure at link time if memmgr.h wasn't included everywhere
it should have been.  This can help a lot on compilers such as THINK C.
It means, however, that libraries that use MemMgr should be recompiled
and reinstalled, or programs using those libraries will get "undefined
symbol" errors for MemMgr function names.

memmgr.h now idempotent; may be included more than once safely.