dFNC Stats Batch Functionality

[bbradt]

Similar to running MANCOVA batch, we need batch dFNC stats functionality for GIFT.

[bbradt]

This is the current function in GIFT: https://github.com/trendscenter/gift/blob/dfc08ba442fe8b50b3ed27cf3705664618f31d11/GroupICAT/icatb/icatb_helper_functions/icatb_dfnc_stats.m

and we want to create BATCH functionality like for MANCOVA:
https://github.com/trendscenter/gift/blob/dfc08ba442fe8b50b3ed27cf3705664618f31d11/GroupICAT/icatb/icatb_mancovan_files/icatb_mancovan_batch.m