merge: add state extras merge state data
In future commits we will want to store more data related to each file in the
merge state. This patch adds an optional record for storing a dictionary of
extras for each file.
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
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Running without installing:
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See https://mercurial-scm.org/ for detailed installation
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