This is the third and final batch of makefile changes this round.

This is the third and final batch of makefile changes this round.
These are Makefiles that do not participate in progressive yet have
still been brought current.

* added exec_prefix
* default bindir now exec_prefix/bin
* default libdir now exec_prefix/lib
* default mandir now prefix/man
* default infodir now prefix/info
* added oldincludedir, default NULL
* remove all traces of the old -subdirs and -namesubdir support,
  including code, for loops, and all subdir/unsubdir stuff.
* remove old style staging targets {de-}stage[1234], comparison,
  bootstrapN, from all but the bootstrappable tools.
* added check targets.
* removed any "Last Mod" lines.
* forced copyrights to '92 and shifted some from Cygnus to FSF.
* added tooldir and program_prefix where needed.
* updated texinfo and man pages, removed all references to multiple
  hosts or targets.