applybundle: take source as argument
We allow specifying the source to carry it to hooks. This gets us closer to
'bundle1.apply(...)' and will allow us to remove regressions in multiple places
where we forget to pass the source to hooks.
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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