Improved error reporting for file read ins.
Improved error reporting for file read ins.

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