Merge branch 'compile_with_gcc7' into develop

doc/conf/conf.py

modules/base/src/test_utils/compare_files.cc

modules/config/base.hh

modules/doc/install.rst

modules/gfx/src/scene.cc

modules/gfx/src/texture.hh

modules/gui/src/data_viewer/data_viewer.hh

modules/gui/src/data_viewer/data_viewer_panel_base.hh

modules/gui/src/data_viewer/fft_panel.hh

modules/gui/src/file_type_dialog.hh

modules/img/base/src/base.hh

modules/img/base/src/image_handle.cc

modules/info/src/info_handle.cc

modules/io/tests/test_mmcif_reader.cc

modules/mol/alg/doc/molalg.rst

modules/mol/alg/src/filter_clashes.cc

modules/mol/base/src/bond_handle.cc

modules/mol/base/src/impl/atom_impl.cc

modules/mol/base/src/surface_handle.hh