Update the workflow overview diagram as SVG, PDF, and PNG based on feedback from Bob and Yaxing.  We removed the box labelled '20+ Terrestrial Biosheric Models' since it is basically represented in the 'Global Simulations ...' box.  Applied use cases to the driver data QA/QC step and the 'standard model driver input' box, showing that these data will be available through DataONE's test environment.