Add functionality of the dynamic FF model to master:
 - Optimise biosphere
 - Easy way to change variables to optimise
 - cleaned up code

baseclasses obs.py and observationoperator.py are now used in the Random ObsOperator project

See merge request !14

This commit will allow the basic CTDAS code to run, using baseclasses obs.py, observationoperator.py, pipeline.py, and optimizer.py.

The observations created now are a simple list of 10 values, which get added a random white noise by the obs operator.

Next challenge is to also bring in statevector.py from the baseclass as well, without dependencies on external files.

Updated the cartesius platform file to Python3

See merge request !13