Merge pull request #4 from wpoely86/master

Force use of HDF5 1.8 API
Merge pull request #5 from wpoely86/master

Now with the actual header file :o)
DMRG: use correct HDF5 header
test7 added to test the modifications in 4-index, 2-index, and Ham.
The MoldenWriter has changed in the post-psi4b5 version on github.