lib/runscripts/table.run: use new util.set_col_names_with_metadata() instead of util.set_col_names() so that metadata values (beginning with : ) are automatically mapped to constant columns rather than needing to add a mk_const_col() call to postprocess.sql for each of them. there are a lot of metadata value entries, especially in the Source/ tables for each datasource, so this will save time in translating the datasources to new-style import. note that this requires disabling the map_filter_insert trigger on the map table to prevent it from filtering out the metadata entries before util.set_col_names_with_metadata() can use them.