add test for geometry with eigen2_ prefixes. fix that stuff.

Eigen/src/Eigen2Support/Geometry/Translation.h

@@ -22,8 +22,8 @@
 // License and a copy of the GNU General Public License along with
 // Eigen. If not, see <http://www.gnu.org/licenses/>.
 
-#ifndef EIGEN_TRANSLATION_H
-#define EIGEN_TRANSLATION_H
+// no include guard, we'll include this twice from All.h from Eigen2Support, and it's internal anyway
+
 
 /** \geometry_module \ingroup Geometry_Module
   *
@@ -194,5 +194,3 @@ Translation<Scalar,Dim>::operator* (const TransformType& t) const
   res.pretranslate(m_coeffs);
   return res;
 }
-
-#endif // EIGEN_TRANSLATION_H