Merge branch 'develop' into hhblits3

cmake_support/CheckLSBTypes.cmake

modules/gfx/src/bitmap_io.cc

modules/gfx/src/povray.cc

modules/gfx/src/scene.cc

modules/img/alg/src/conjugate.hh

modules/img/alg/src/highest_peak_search_3d.cc

modules/img/alg/src/histogram.hh

modules/img/alg/tests/test_fft.cc

modules/img/base/pymod/export_data_algorithm.cc

modules/img/base/src/data_observer.hh

modules/img/base/src/extent.hh

modules/img/base/src/image_handle.hh

modules/io/doc/io.rst

modules/io/pymod/remote.py

modules/io/src/img/map_io_dm3_handler.cc

modules/io/src/img/map_io_spi_handler.cc

modules/io/src/img/map_io_tiff_handler.cc

modules/io/src/mol/dcd_io.cc

modules/io/src/mol/load_entity.cc

modules/io/src/mol/mmcif_reader.hh