merge: return a mergeresult obj from manifestmerge(), calculateupdates() (API) Earlier, manifestmerge() and calculateupdates() returns a tuple of three things. I wanted to add one more thing to return value. Introducing a special class which represents results of a merge will help understand better and also ease adding new return values. Differential Revision: https://phab.mercurial-scm.org/D8799

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