Changes to be committed:
	deleted:    IGOR
	modified:   Makefile
	renamed:    cell.f95 -> cell.f90
	renamed:    cif2pdb.f95 -> cif2pdb.f90
	renamed:    dft.f95 -> dft.f90
	renamed:    histograms.f95 -> histograms.f90
	renamed:    main.f95 -> main.f90
	renamed:    output.f95 -> output.f90
	renamed:    remove_fake_rings.f95 -> remove_fake_rings.f90
	renamed:    rings_properties.f95 -> rings_properties.f90
	renamed:    vectors.f95 -> vectors.f90