Changes in the CondFormat (Only) necessary for migration to 6x6 APE 

Pull request contains the changes i the CondFormat (only) necessary for migration to 6x6 APEs. The pull request is a subset of the earlier PR, containing these files only:
https://github.com/cms-sw/cmssw/pull/6420/files#diff-124
https://github.com/cms-sw/cmssw/pull/6420/files#diff-169

An extra change (bug fix) in the record mapping is done (CondCore/AlignmentPlugins/src/plugins.cc):

REGISTER_PLUGIN(TrackerAlignmentErrorRcd,AlignmentErrors);
L61
REGISTER_PLUGIN(DTAlignmentErrorRcd,AlignmentErrors);
L64
REGISTER_PLUGIN(CSCAlignmentErrorRcd,AlignmentErrors);
L66

Tested locally under CMSSW_7_3_X_2014-11-18-0200 with runTheMatrix, here is the output: 1 1 1 1 tests passed, 0 0 0 0 failed