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templatekw: add p1rev, p1node, p2rev, p2node keywords

The {parents} template is cumbersome for some uses, as it does not show
anything if there's only one "natural" parent and you can't use it to get the
full 40 digit node hashes for parents unless you rely on the behavior of
the --debug flag.

Introduce four new template keywords: {p1rev}, {p2rev}, {p1node} and
{p2node}. The "node" flavors of these always show full 40 digit hashes,
but users can get the short version with a filter construction like
'{p1node|short}'.

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.