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bundle2: also capture reply capability on failure

When unbundling over the wire is aborted, we have a mechanism to convey the
error inside a bundle part. As we add support for more errors, we need to know if
the client will support them. For this purpose, we duck punch the reply
capabilities of the client on the raised extensions.

This is similar to what is done to salvage the server output on error.

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.