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loader: add an hg-specific mapping for branching

Raphaël Gomès requested to merge generated-differential-D5816-source into generated-differential-D5816-target

As discussed in #3352 (closed), the branching mechanism of Mercurial is more featureful than that of Git's. The Snapshot model was not designed with multiple heads, closed heads, bookmarks, etc. in mind, but with only branches being "pointers" to (mostly) revisions. As a workaround for a possible re-design of the Snapshot model (though nothing of the sort is planned for now), we define a mapping that better represents Mercurial's branching system.

This allows for handling multiple heads per branch and closed branches, whose revisions (if not already covered by another branch) would previously have been lost to the ether. Additionally, bookmarks are now saved to get a better representation of the projects that do use them.

Migrated from D5816 (view on Phabricator)

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