Make compatible with latest version of pandas
Make compatible with latest version of pandas

The NSPN_rois_behavmerge.py file is old and therefore doesn't work
with the latest version of pandas (at time of writing 0.20) because
the sort tool changed to sort_values in 0.17.

This commit updates the code to fix this but does NOT make the code
backwards compatible (I think).

KirstieJane/UCHANGE_ProcessingPipeline,KirstieJane/UCHANGE_ProcessingPipeline