Add support for branches downgraded to add in integrename.rb
(thanks to Martin Gamwell Davids). Also added some code to output
the detected mappings so they can be added to the branch view. The
script doesn't add them automatically since it's complicated to work
out which side of the view the source/dest paths should be and the
user may not want the entries added anyway. At least this way, they
can see what they are.