OPM/opm-core — pull request #19 by Ivarun (2012-08-21 12:23:44+00:00)
Title: Fix associativity bug in get_zcorn_sign

The bug can also cause c2 to be larger than the length of
actnum, leading to segmentation faults.

Since I am new to both OPM and github, please do check this pull request for sanity on both counts :-)