help using tags in .hgguestrepo and merge tools
Created originally on Bitbucket by ddouard (David Douard (Logilab))
Add 2 things:
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the --tag option to the grfreeze command, so one can easily produce a .hgguestrepo file with tag names instead of csid (when the revision on which the guest repo is a tagged revision; if there are several tags, select the shorted one),
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provide 2 specific merge tools to ease merging .hggrmapping and .hgguestrepo