* doc/cgenint.texi: Renamed from internals.texi. Several cleanups.

	* doc/cgenint.texi: Renamed from internals.texi.  Several cleanups.
	* doc/app.texi: Cleanup pass.
	* doc/cgen.texi: Cleanup pass.
	* doc/glossary.texi: Add entries for ifield, iformat, sformat, insn.
	* doc/intro.texi: Cleanup pass.
	* doc/mdate-sh: New file.
	* doc/opcodes.texi: Cleanup pass.
	* doc/pmacros.texi: Cleanup pass.
	* doc/porting.texi: Cleanup pass.
	* doc/rtl.texi: Cleanup pass.
	* doc/running.texi: Cleanup pass.  Document more runtime options.
	* doc/stamp-vti: Update.
	* doc/version.texi: Update.