revert: use p2 as parent when reverting against it
revert was always using p1 as parent. This created some minor misbehavior when
reverting against p2. See test change for an example of that.
This is also a useful cleanup for coming refactoring to revert.
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
for software developers.
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 http://mercurial.selenic.com/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.