Cleanup of changelog, rules and control files.
Fixed copyright file handling and removed lintian-overrides for copyright file errors.
Removed 'marketing' type echo statements that are useless and will never be seen by anyone about UDFs.
Removed non-ascii black magic nonsense for ancient 5.0 from .preinst file.
Removed prerm file that does nothing useful in modern times.
Added README.source and repack.sh to explain and show how to take a raw Percona Source tarball and turn it into a Debian .orig.tar.gz. Fixed up rules file to get versions compiled in properly.