ERT-341 - Create python wrappers for the PCA plot data 'classes'
ERT-341 - Fixed a bug related to histogram plotting of non-simulated data types
ERT-341 - Code cleanup
ERT-341 - Added several classes to support pca creation
ERT-341 - Added fetcher for PCA plot data
Merge remote-tracking branch 'upstream/master' into ERT-341
ERT-341 - Fixes from comments.
ERT-341 - Renamed ensemble_data to plot_data
Merge pull request #428 from jepebe/ERT-341

Ert 341 Python wrappers for PCA plot data types.