fast-export can only handle one head per branch. This plugin makes it possible
to create a new branch from a head by specifying the new branch name and
the first divergent commit for that head.
Note: the hg hash must be in the full form, 40 hexadecimal characters.
Note: you must run fast-export with --ignore-unnamed-heads option,
otherwise, the conversion will fail.
To use the plugin, add the command line flag --plugin head2branch=name,<hg_hash>.
The flag can be given multiple times to name more than one head.