I've tested the current incarnation of the update with mysql and sqlite, in both
cases by installing and configuring OC 5 then upgrading to OC 6 (to exercise the
upgrade migration path). Both cases work OK, tested basic file, contact and
calendar manipulations. I'll take another swing at pgsql testing later. We
should probably push 6.0.1 out stable soon, then look at bumping to 6.0.2.