lock: add a trylock method handling the timeout and messaging logic
We are about to make the messages around lock more flexible. We move all the
currently logic into a function in the lock module. We'll update the message
scheme in the next changeset.
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
$ ./hg --version # should show the latest version
See https://mercurial-scm.org/ for detailed installation
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