PMR2 with Plone 4.3

- Includes diazo version of the CellML Theme.
Bumping Plone to 4.3.1

- For some critical UI bug fixes.
Organization was renamed.
Version bump
Version specifications for release 7.
Need that there...
libgit2 and pygit2 support.
Adding pmr2.git.
Adding pmr2.tempauth.
Using a more proper dist server.
Specify mercurial download location

- pypi doesn't contain the old historical versions that still being
  relied on due to the previous lack of hglib.
Include the morre.pmr2 addon.