allow incoming repos via Intent when on ManageRepo view
Since before, incoming repo Intents where handled in the Fragment's
onCreate(), an Intent that was received while the Fragment was visible was
just ignored. Activities have onNewIntent() for that, but Fragments don't
so the repo Intent handling had to be moved to the ManageRepo Activity.
That makes for a more direct relationship anyway, since ManageRepo is what
is configured as receiving all those Intents in AndroidManifest.xml.