btidor's hotfixes to cybersource

(cherry picked from commit a306ee8d889401c5e52c91922a522d1c0e2f4697)
Cybersource credit card module: reject "ERROR" decisions.

(cherry picked from commit 7af7f5303b1bfb2d479a8a9b963011cd4a833374)
Merge pull request #1498 from learning-unlimited/mit-cybersource-fixes

Cybersource fixes