Added support for edge correction to sampling point Roc class.  BUT need to merge this with as-yet un-committed changes at UCL.  Currently throwing an error due to handling of kwargs in Vb.set_grid, but think this was already handled elsewhere.
TODO: add grid label output to validation results, in descending order?
Merged ROC label changes into master - main addition is edge_Respect algorithm in sample point Roc code.
Merge remote-tracking branch 'origin/roc_labels'

Conflicts:
	analysis/roc.py
	setUp_chicago_validation.py
Some kind of error introduced som that now the igrid in Roc contains overlaps... Probably in the analysis.spatial module?  Just instantiate a roc class with a poly and see whether it happens - no need to train the model.