set CMake policies CMP0026 and CMP0048 to OLD

this is required for CMake 3.0 to stop it complaining that we access
the LOCATION target property and set the *_VERSION_* variables ourselves.
Merge pull request #659 from OPM/fix_cmake_3_0_warnings

set CMake policies CMP0026 and CMP0048 to OLD
Removed 'dead' data at the end of test data.
Added test for SHUT well
WellsManager: do not require a control mode to be set if the well status is SHUT

For Norne it fell on its nose because of this...
Merge pull request #664 from joakim-hove/well-shut-test

Well shut test