These are the changes for the propagation of the tag cut selection

These are the changes for the propagation of the tag cut selection
bookkeeping.
  I have tested it in the following way:
  - Created XML list with cut summary in, read it via the
AliTagAnalysis, put it as a UserInfo object into the chain and recovered
the information in the task via the ESD Handler
  - Checked that the same code does not crash if the tag summary
information is not available in the XML list.

A. Kisiel