pager: move pager-initiating code into core
No functionality change.
A previous version of this API had a category argument on
ui.pager(). As I migrated the commands in core, I couldn't come up
with good enough consistency in any categorization scheme so I just
scrapped the whole idea. It may be worth revisiting in the future.
Mercurial's documentation is kept in reStructuredText format, which is
a simple plain text format that's easy to read and edit:
http://docutils.sourceforge.net/rst.html
It's also convertible to a variety of other formats including standard
UNIX man page format and HTML. You'll need to install Docutils:
http://docutils.sourceforge.net/
Use the Makefile in this directory to generate the man and HTML pages.