Patches to support python: 1/5: Proposed commit log text.

[Dennis Heimbigner]

Add support for parsers using the python language.

* NEWS: Mention Python
* bootstrap.conf: Add pythoncomp-script and pythonexec-script.
* configure.ac: Invoke gt_PYTHONCOMP and gt_PYTHONEXEC.

* data/local.mk: Add new files.
* data/lalr1.py: New.
* data/python.m4: New.
* data/python-skel.m4: New.

* doc/bison.texinfo: Add section on python  Parsers and add
  references to python in various places.

* src/getargs.c (valid_languages): Add Python.
* src/getargs.h (struct bison_language): Update size of string fields.
* src/parse-gram.y : Python requires no-lines.

* tests/local.mk: Add python.at.
* tests/atlocal.in: Add CONF_PYTHON and CONF_PYTHONC.
* tests/local.at: Add python to various macros.
* tests/python.at: New.
* tests/testsuite.at: Include python.at
* tests/javapush.at: Modified to remove macro name conflicts wrt python

* gnulib/ChangeLog: Add reference to python-specific changes.
* gnulib/MODULES.html.sh: add func_module pythonexec and
                          pythonexec-script.
* gnulib/build-aux/pythoncomp.sh.in: New.
* gnulib/build-aux/pythonexec.sh.in: New.
* gnulib/lib/pythoncomp.c: New.
* gnulib/lib/pythoncomp.h: New.
* gnulib/lib/pythonexec.c: New.
* gnulib/lib/pythonexec.h: New.
* gnulib/m4/pythoncomp.m4: New.
* gnulib/m4/pythonexec.m4: New.
* gnulib/modules/pythoncomp: New.
* gnulib/modules/pythoncomp-script: New.
* gnulib/modules/pythonexec: New.
* gnulib/modules/pythonexec-script: New.