Removed two small Bugs

As of right ddyn_u is not compatible with the vdw
KS Charge Density Output Fixed
Wannier Centers Saved to data-file.xml

Current Wannier centers are now written-to and read-from the
data-file.xml.  They are under the tag WANNIER_CENTERS.
At this time they are only tested with the cp-wf calculation using the
lwf control_flag as a determination for their inclusion.

Future work:
1)Further specify if the calculation is a cp-wf or a cp-wf-nscf
calculation,
   both use lwf.
2)for the cp-wf-nscf calculations, write them to wfc_nscf
Updated Configuration Files