fixed several doxygen documentation errors

modules/img/alg/src/dft.hh

modules/io/doc/io.dox

modules/io/pymod/__init__.py

modules/io/src/mol/mmcif_info.hh

modules/io/src/mol/mmcif_reader.hh

modules/mol/alg/src/distance_rmsd_test.hh

modules/mol/alg/src/local_dist_diff_test.hh

modules/mol/base/src/atom_base.hh

modules/mol/base/src/coord_group.hh

modules/mol/base/src/editor_base.hh

modules/mol/base/src/entity_base.hh

modules/mol/base/src/entity_handle.hh

modules/mol/base/src/residue_base.hh

modules/mol/base/src/view_op.hh

modules/seq/alg/src/merge_pairwise_alignments.hh