Adding EBCDIC code page 1047.

Adding EBCDIC code page 1047.

* fonts/devcp1047/R.proto, fonts/devcp1047/Makefile.sub,
fonts/devcp1047/DESC.proto: New files.

* aclocal.m4 (GROFF_EBCDIC): Introduce TTYDEVDIRS which can be
either ascii/latin1 or cp1047.
* Makefile.in: Use it.
* configure: Updated.

Replacing and/or adding `md' (mathdot) glyph with `pc'
(periodcentered) in all text fonts.

* fonts/*/*: Change it.

* aclocal.m4 (GROFF_OS390): Fixing compiler flags.

* configure.in: Add check for strings.h.
* src/include/driver.h: Use HAVE_STRINGS_H.
* src/devices/grolbp/lpb.cc: Remove string.h.

* src/include/groff-getopt.h: New file.  It will be used instead of
getopt.h (to be included in lib.h) to avoid endless problems with
picky C++ compilers.
* src/include/lib.h: Use groff-getopt.h.
* src/include/Makefile.sub: Updated.

* configure: Updated.
* Makefile.in: Updated.

* NEWS: Mention EBCDIC support.

* TODO: Some additions.

* src/roff/troff/troff.man, doc/groff.texinfo: Fixing documentation
of mso request.

* src/roff/troff/troff.man: Minor fixes.