Docs and AMIDST Metrics job.

* docs: Add GTR version-matrix oin CHANGES/README.
* metrics: FIX arrows-diagram to poin-point exactly each vehicle.
* plots: Possible to re-invoke diagrams to add more datasets.
* docs: Add GTR version-matrix oin CHANGES/README.
* metrics: FIX arrows-diagram to poin-point exactly each vehicle.
* plots: Possible to re-invoke Scatter diff-diagram to add more
datasets.
* wltpdb: Augment master-vehicle file with 'pmr', 'class' and
'downscale' factors.
* tkui: Minor test GUI methods.
tkui: Add logging panel