Fix minor things before release

Bumped various version numbers

Trivial fix to install guide

Removed out-of-date gmxfaq.html and links to it, replaced links with
links to up-to-date FAQ

share/html/online.html is generated by mkhtml, so stopped caching it
in the repo.

Change-Id: I52265e1174f6e42a2a9d056c3a1751c1cd5886ac