fixes for g++ 2.96

["Randall C. O'Reilly" <oreilly@grey.colorado.edu>]

I finally got a machine with redhat 7.1 on it, which has g++ 2.96 that
has caused some problems for others compiling on various
distributions of linux.  I fixed all the annoying compiling bugs, and
made new config/Makefile.LINUX[debug].rh71 makefiles that specify
/usr/include/g++-3 instead of -2, which makes everything happy.  I
uploaded the source code with these fixes (which is also very close to
the final 2.1 version -- just a few more things to fix..) to the grey
ftp site if you need it:

ftp://grey.colorado.edu/pub/oreilly/pdp++/pdp++_2.1a_src.tar.gz

				- Randy