dirstate: introduce a symbolic constant for the NONNORMAL marker
This is going to be clearer and easier to track than -1. Ultimately I would
like to get ride of this special value everywhere but in the lower level,
however we need to clarify the API first. This changeset is part of such
clarification.
Differential Revision: https://phab.mercurial-scm.org/D10927
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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Basic install::
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
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See https://mercurial-scm.org/ for detailed installation
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Notes for packagers
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Mercurial ships a copy of the python-zstandard sources. This is used to
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