changegroup: remove external uses of getbundler
Now that makestream and makechangegroup are the primary creation methods for
changegroups, let's get rid of this rogue use of getbundler and getsubsetraw.
Differential Revision: https://phab.mercurial-scm.org/D670
Mercurial's documentation is kept in reStructuredText format, which is
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http://docutils.sourceforge.net/
Use the Makefile in this directory to generate the man and HTML pages.