Cleaned up the makefiles a bit.
Ran ccprep on the *.c files, so that occ with -g produces good debug
code. (Reported problem with Orca/C's #append directive.)
Fixed stat() bug when running under Orca/Shell.
Changed EXTERN to extern in common.h, and added globals.c to compensate.
Fixed bug in IIgs version where invoking "udl -<flags> filename/" (with
the trailing '/') would cause udl to fail due to bad filenames.
Added "help" subdirectory. The file "help/udl" is created at build time,
and therefore not checked in.
Added some "#pragma noroot"s.
The temp file is now created in the same directory as the original file,
then renamed after the conversion is done.
Some small doc changes were made as well, mostly typos and addresses.
