Bugfix in hasAccessor() which might cause missing collections in AddCollection dialog.
Fix crash when set projection center -> Add x, y, z values in FWItemValueGetter for Vertices purpose.
Import bugfix in data compatiblity check from Bill. See issue 1053.
Merge pull request #1069 from alja/CMSSW_7_0_X

Fireworks fixes -- Fixes in Firewors/Core in data-compatibility check, item accessors, and interface to projection center.