merge: add a 'keepconflictparent' argument to graft
Before this change, `merge.graft` was always dropping the "grafted" changeset
from the parent. This is impractical in case of conflict as the second parent
can be useful to help with conflict resolution.
We add a new boolean parameter to control this behavior. This will make using
`merge.graft` directly in shelve practicable.
Differential Revision: https://phab.mercurial-scm.org/D3692
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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