[PQM/MERGE] Miscellaneous further cleanup

[Daniel Mark Watkins]

This patch is a little messier than the last few have been, as I just
started fixing things as I saw them.  It does the following things:
  * Moves merge-related stuff from Command to MergeCommand
  * Removes the merge_method parameter to (what is now)
    MergeCommand.do_merge as there is now only a single merge method
    used
  * Renames Bazaar2Handler to BzrHandler
  * Removes VCSHandler
  * Removes a debug statement from a test
  * Removes references to config files which are no longer relevant


Dan
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