No HDF5 integration with Eigen3 matrices

[ryanlevy]

In ublas_vector.hpp there was the save method, which is incompatible with MatrixXd etc. HDF5 output in the Eigen3 branch has been commented out for now

[ryanlevy]

Eigen::VectorXd (Matrix<double,1,Dynamic>) is now supported for saving. Not sure if it makes sense to implement all of the member functions in alps/hdf5/vector

[egull]

Probably does make sense, and we can add this to Alex' todo list ;-) it should be easy to do and we're siwtching over to Eigen from Ublas anyway.

[egull]

(reopened, closed by accident)