Turns on the new mutator set by default #710
Merged
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The new mutators set provides more stable return type mutators with a more easily understood behaviour. There were concerns that it may result in increased numbers of equivalent mutators, but the filters for these seem to be working well.
This PR renames the NEW_DEFAULTS mutator set to DEFAULTS and create a group called OLD_DEFAULTS to allow access to the original set.
History files will be invalidated by this change and should be deleted when upgrading.