Added rotation to the tests run by ctest

Was forgotten when the rotation tests were added and thus
they weren't run by Jenkins

Change-Id: I27fc51b1314e6377d1e866a8ba4658700cc71cfa
Clarified GPU selection output and mdrun help

The reporting of GPU selection has been confusing when devices are
shared as GPU IDs would show up multiple times in a list of "devices
selected to be used." The reporting has been modified to print the
number of devices selected followed by the GPU to PP rank mapping which
is in fact exactly the previously printed list of IDs.

Additionally, the mdrun help page now explicitly states that the GPU ID
string passed with -gpu_id specifies a per-node GPU to PP rank mapping
and that multiple ranks can share GPUs.

Change-Id: Id98c592c1dd38573df003247281e4edf50debba7
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Removed out-of-date gmxfaq.html and links to it, replaced links with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
Bugfix for "Correct channel fluxes also with multimeric channels"
Merge branch 'release-4-6' into comp_el_r46