tests: show that interactive shelve can leave the repo with a merge state
If part of a file is shelved (as we already do in a test), there will
be an unfinished merge state left after `hg shelve` finishes. There
should never be a merge conflict and there should never be a reason
that the user would like to re-resolve conflicts, so we should clear
that state (see next patch).
Differential Revision: https://phab.mercurial-scm.org/D9334
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.