Tomokayama/ogs — pull request #3 by HaibingShao (2013-02-06 14:52:06+00:00)
Title: Add richards

The RichardsFlow benchmark has been fixed.
For now, the gravity force is always added in the y direction, so that the results will exactly fit with those from ogs5.
Once we have decide how to include gravity, this needs to be changed back.

I can go through all commits with you together.