tests: add more tests for "hg shelve --delete"
It appears that the only tests for "hg shelve --delete" concern command
errors (e.g. incompatible command options). Adding some more to check
that non-existent names are handled and a success case.
Differential Revision: https://phab.mercurial-scm.org/D7460
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.