ufz/ogs — pull request #219 by norihiro-w (2013-09-06 13:58:49+00:00)
Title: Use Eigen in OGS

This PR doesn't include any codes using Eigen but is needed later for testing FemLib using Eigen.

Remarks
* You can deactivate debugging of Eigen by EIGEN_NO_DEBUG option. It is known that Eigen is slow in debug mode.
* EIGEN_INITIALIZE_MATRICES_BY_ZERO is always defined.