Add -V or --version command line arguments.

At some point in the near future, I suspect a user will ask for help and
the version of Temoa in use may be a pertinent detail.  We've already
partially had this problem with Fan.

In a follow up commit, I'll have the deploy script auto change the
TEMOA_* variables when creating the temoa.py ZIP file.
Update documentation: links, patches

Update to the text of the patches section.  We now only accept AGPLv3+,
not just AGPLv3.  The plus sign indicates that if the Temoa Project
accepts any outside contributor's code, we are limited to the AGPL but
are free to use any later version (at our discretion) than v3.

A couple of links were dead, and added a couple pursuant the patches
section update.