inputs/bien_web/observation/VegBIEN.csv: regenerated now that *_index dummy columns have been removed

inputs/.TNRS/schema.sql: tnrs_populate_fields(): updated runtimes. it now takes 25 min instead of 16 min to regenerate the derived cols.

inputs/IRMNG/_README.TXT: added note that when refreshing this datasource, remember to regenerate the TNRS derived cols using the instructions in inputs/.TNRS/schema.sql > tnrs_populate_fields()

bin/*: replaced confusing regexp constructs involving \W inside [] with the much clearer explicit character class [:alnum:] . this avoids adding or subtracting from an inverted class in order to reach a subset of the corresponding positive class, because the subset can just be named explicitly instead.

bugfix: bin/repl: doesn't make sense to use other chars in a [^\W_] regexp, because they will have no effect since \w doesn't include the other chars to begin with. this is a result of confusion with the ^ and \W double negative.

lib/runscripts/table.run: postprocess(): propagate the $remake flag to remake_VegBIEN_mappings using self_make, so that a remake=1 on postprocess will cause map.csv to be regenerated as it would for a remake=1 directly on remake_VegBIEN_mappings

bugfix: postprocess(): moved $can_test flag from import() to this function because it is used here

lib/runscripts/table.run: import(): moved postprocessing commands to separate postprocess() function that can be invoked on an already-imported staging table to avoid running the load_data() target. this is especially useful when running the postprocessing on a working copy without the unversioned data files, for datasources whose load_data() target would otherwise try to download the files because they don't already exist.

lib/runscripts/table.run: postprocess(): renamed to custom_postprocess() since this runs only the datasource's custom postprocessing commands, not all the postprocessing commands including map_table, mk_derived

lib/runscripts/util.run: added , function, which treats each of the command-line args as commands the way make does (instead of as args to the same command, the way runscripts do)