Start OnlineGP implementation. First passing test.
Implement MSE prediction.
Refactor for better caching ...

... of intermediate results.
Allow to add data online to GP.

Needs still some refactoring at different places.
Ignore .ropeproject.
Refactor variable names.
Allow adding empty datasets.
Trained indicator test.
Remove uneeded commented code.
Test data as list.
Remove retraining stuff.

Unlikely to be of any use.
Fix pylint errors.
Allow to use buffer other than GrowableArray.
Allow to pass expected size estimate.
pylint
Calc GP derivative and refactoring.
Refactor for more performance.
Add calculation of MSE derivative.
Add log likelihood calculation.
Add squeeze just to be sure.