High level run_vr function

[jacobcook1995]

Is your feature request related to a problem? Please describe.
As Diego suggested we need a high level function to run the virtual rainforest model

Describe the solution you'd like
This function should read in the data from the data system, run the configuration process, use this information to set up a set of models to run, then use a timing loop to solve the models over time, and finally save output data.