[Opm] OPM release 2016.10 release candidate

[Atgeirr Rasmussen]

Dear OPM community,

A release candidate is ready for testing. There are binary packages available for 64-bit Ubuntu 14.04, Ubuntu 16.04 and RHEL 6.

For those building from source, the relevant branch is called release/2016.10 in each repository. There is a single change to the
module structure since the last release, namely that the build order of opm-output and opm-core has been switched (opm-core
now requires opm-output).

For Ubuntu, note that the binary packages are not in the usual (ppa:opm/ppa) archive but in ppa:opm/testing. To install (for example)
Flow from opm-simulators, you should do the following:

sudo apt-add-repository ppa:opm/testing
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install libopm-simulators-bin

There is a known issue with two-phase simulations in Flow that affects the currently available packages. The issue has been addressed,
and the fix will be part of the final release.

Atgeirr