updated group analysis pipeline to handle dual regression mutiple files
updated group analysis pipeline to handle dual regression mutiple files

danlurie/C-PAC,danlurie/C-PAC,roijo/C-PAC_complexitytools,sgiavasis/C-PAC,roijo/C-PAC_complexitytools,danlurie/C-PAC,sgiavasis/C-PAC,sgiavasis/C-PAC,roijo/C-PAC_complexitytools,roijo/C-PAC_complexitytools,danlurie/C-PAC,sgiavasis/C-PAC