_get_rules_as_component_lists             _read_components_from_rulefile
_get_ruleobj_list_from_component_lists    _get_ruleobjs_from_components

_get_rulefile_chain                       _find_rulefile_chain
_get_rootdir_path                         _find_rootdir_path
_get_visiblefile_paths                    _find_visiblefile_paths
get_datadir_paths_below                   find_data_subdir_paths

_get_backupsub_path                       _form_backupsub_pathname
_get_htmldir_path                         _form_htmldir_pathname

_get_linkified_textline                   _return_textline_linkified
_get_validated_filename                   _return_filename_validated

