ERT-425 - Refactored plot data structures and improved histograms.
Merge remote-tracking branch 'joaho/read-only-timemap' into performance
ERT-422 - Added read only time map to enkf_fs_manager.py
ERT-425 - Histograms added. Some color changes.
Merge remote-tracking branch 'upstream/master' into performance
ERT-425 - Missing CMakeLists.txt entry
Merge pull request #309 from jepebe/histogram

Pure eye candy. Very good!