Merge dev into master as release v2016.11 (pull request OPM#1008)

Release v2016.11

Upped to 1.6.7-gm-beta for release of the intermediate version used i…

…n the Geomech Well Related project.

Merge pull request OPM#715 from OPM/dev

Pull request for 1.6.0 for dev to master

Merge pull request OPM#631 from OPM/dev

Copy up dev to master for release 1.5.0

Merge pull request OPM#389 from OPM/dev

Copy up dev to master for release 1.4.0

Enable usage of external ERT source

This change in cmakelist enables the usage of an external ERT source. You can now point to a later version of ERT and use this in sted of the one bundled in the ResInsight source.

Merge pull request OPM#259 from OPM/dev

Updated to 1.3.1

Merge pull request OPM#245 from OPM/dev

Copy up dev to master for release 1.3.0

Merge pull request OPM#194 from OPM/dev

Copy up dev to master for release 1.2.0

Merge pull request OPM#154 from OPM/dev

Documentation updates