README

templatekw/help: document the {parents} keyword

The {parents} keyword does not appear in the generated documentation for
templates because it is added by `changeset_templater` (and this is because
its behavior depends on `ui`, so it can't be defined as a normal template
keyword; see comments in `changeset_templater._show()`).

Add it to the documentation synthetically by creating a stub documentation
function.

Test plan: built the docs and examined the man page to verify that this
keyword is now documented. I'm not sure how to test the i18n extraction part,
but assume it will just work given that this patch doesn't do anything too
crazy.

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.