Update rw_inp.f90: For Wannier-function calculations it is often
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.
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