gprofng: Update documentation

gprofng: Update documentation

This patch addresses bugzilla 29521:
Bug 29521 - [docs] man pages are not in the release tarball

The dependence on help2man to create the man pages has been eliminated.
All man pages are now written in Texinfo. Texi2pod and pod2man are used
to generate the man pages from the source.

The user guide has been significantly expanded. It also includes all
the man pages. These are formatted appropriately in the INFO, PDF, and
HTML formats.

The index in the user guide has been enhanced to include an overview
of all options and commands that have been documented so far.

The work on the documentation has not been completed, but this is
a significant step forward.

gprofng/ChangeLog
2023-04-15  Vladimir Mezentsev  <vladimir.mezentsev@oracle.com>

	PR gprofng/29521
	* doc/Makefile.am: Build documentation.
	* doc/gprofng.texi: Update documentation.
	* doc/version.texi: Likewise.
	* src/Makefile.am: Move the man pages generation to doc/Makefile.am.
	* gp-display-html/Makefile.am: Likewise.
	* doc/gp-archive.texi: New file.
	* doc/gp-collect-app.texi: New file.
	* doc/gp-display-html.texi: New file.
	* doc/gp-display-src.texi: New file.
	* doc/gp-display-text.texi: New file.
	* doc/gp-macros.texi: New file.
	* doc/gprofng_ug.texi: New file.
	* doc/Makefile.in: Rebuild.
	* gp-display-html/Makefile.in: Rebuild.
	* src/Makefile.in" Rebuild.