setup: add a test for running setup.py `python3 -m pip install hg-evolve==9.2.0` currently fails, despite 9.2.0 being the first beta py3 release, because of unicode issues with the version number. `setup.py install` is a proxy test for pip install since it also suffers from similar, however the test currently fails due to running setup.py from a different directory to the one it is in. Also add a test for `hg version -v` with evolve enabled since a naive first solution for the pip issue was to just change `__version__` to a `u''` string, but that busts version display in `version -v`, which isn't currently picked up by tests.

-------------------------
Evolve Commands Reference
-------------------------

.. highlight:: none

amend
-----

.. hghelp:: amend

evolve
------

.. hghelp:: evolve

fold
----

.. hghelp:: fold

metaedit
--------

.. hghelp:: metaedit

next
----

.. hghelp:: next

obslog
------

.. hghelp:: obslog

pdiff
-----

.. hghelp:: pdiff

previous
--------

.. hghelp:: previous

prune
-----

.. hghelp:: prune

pstatus
-------

.. hghelp:: pstatus

split
-----

.. hghelp:: split

touch
-----

.. hghelp:: touch

uncommit
--------

.. hghelp:: uncommit