bugfix: inputs/input.Makefile: %/install: don't run $(cleanup) if it has already been run by $(import_install_), so that it doesn't run twice

inputs/input.Makefile: %/postprocess: don't run postprocess.sql if it is supposed to be run by a runscript, because postprocess.sql may then depend on additional steps the runscript runs before it

lib/runscripts/table.run: import(): use self_make on load_data so that the remake status determines whether the table is reinstalled

bugfix: lib/runscripts/mysql.table.run: import(): added missing set_make_vars, needed by self_make

bugfix: lib/runscripts/table.run: load_data(): need to use $_remake instead of $remake when using set_make_vars

lib/runscripts/table.run: added set_make_vars to all make targets so $remake would be propagated appropriately

lib/runscripts/table.run: load_data(): also clobber install log if remaking, because the table will be reinstalled

lib/runscripts/table.run: load_data(): automatically select noclobber mode depending on whether the install log already exists. this removes the need for a separate load_data_first_run() function.

bugfix: lib/runscripts/table.run: load_data(): ignore errors if table already exists

lib/runscripts/table.run: load_data(): use noclobber=1 to avoid overwriting the install log when re-running the install target idempotently. load_data_first_run() is now available to preserve the output in the log on the first run.