Adding new parents to existing Butler repositories

DM-10340 is merged to master. This fixes an issue where mapperArgs were dropped when loading an already-existing output repository.

It also allows new parents to be added to existing output repositories. This is useful when using the same output repository for multiple steps of processing and a new input needs to be added. This should address issues that @nchotard and @price have run into over the last few weeks that we have discussed on Slack.

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