necessary to keep the eig-file, because otherwise the phase-relationship
between Bloch functions and Wannier-functions is not known. Therefore, in the
past, the eig.hdf file was generated during a first run, where the mmn and amn
files are generated. In subsequent runs of the wannier-branch the eig.hdf file
could be reused by setting eig66=T in the inp file. This ensured consistent
phase relations between bloch functions and wannier functions and therefore
a consistent choice of phases between all files generated in the wannier branch.
Since the eig66 switch has disappeared in the MaX-Release, I try to revive it
with this commit.