split the innoDB upgrade out of the version section, so that it always checked for MyISAM tables and if found, offers to update them.
cleanups, only connect and disconnect once.  Remove unncessary require's of DBI
cleanup MyISAM to InnoDB code
Merge pull request #251 from ZoneMinder/betterInnoDBupdate

InnoDB upgrae and DB connection improvements to zmupdate.pl