changegroup: change topics during generation
Changegroup generation and consumption currently uses different sets of
topics. Generation uses "bundling" and consumption uses the name of the
thing being consumed.
This commit makes the topic and unit names consistent on both ends.
The reason I chose to change the generation side is because when
"bundling" is used for 3 different stages, it is unclear which stage
of changegroup generation we're in. By making the topics "changesets,"
"manifests," and "files," one can get a better feel for how far along
in the bundling process we are.
Differential Revision: https://phab.mercurial-scm.org/D4272
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.