Peter M. Groen / openbr

…ition and plot; adding script to do weighted fusion comparison plots of facerecognition, attributes and the weighted fusion of the two

Conflicts:
	openbr/plugins/distance.cpp
	openbr/plugins/template.cpp

downloading all the datasets in downloadDatasets.sh is time consuming, and
MEDS is the only dataset used in make test, as well as
evalFaceRecognition-MEDS.sh. Splitting MEDS to a searate file simplifies
the process of validating an OpenBR build.

Fix syntax error when running in Python 3
while maintaining Python 2 compatability

Rscript will actually crash partway through writing the output pdf, presumably
because the recognition curves are degeenrate in this case.