Added tools/tarballs-to-fossil, the Bash script used to convert the
archive of MySQL++ tarballs to Fossil major-version checkins on the new
Fossil repository.  This is checked in after hopefully becoming obsolete
by way of documenting how the conversion was performed.

This checkin also includes tools/tb-ignore-glob, the "fossil addremove
--ignore" rule set used by the script, which documents which files were
filtered out of the tarballs: basically, any file that could be
generated from one of the other files that were checked in for that
major version.

Because this list could be overly "grabby," particularly for older
releases (e.g. "Makefile" in the pre-Autoconf and pre-Bakefile worlds)
and because modern systems may not always be able to recreate generated
files from the more antiquated sources in any case, the tarballs will
remain the primary data sources.