lib/sh/local.sh: psql(): documented that --output is actually for query results, not echoed statements (and thus must be redirected back to fd 1 while fd 1 with the statements gets sent to the logging port)

lib/sh/local.sh: psql(): documented why can't use fd 11

lib/sh/local.sh: use @redirs instead of manual redirection to set up --output fd, so that the redirection will be echoed along with the command. for some reason, this requires switching to fd 13 instead of 11, because fd 11 gives a "/dev/fd/11: Bad file descriptor" error when 11 is set with exec right before the command instead of on the subshell the command is executed in. (13 was chosen rather than 12 because 2 is for errors, while *3 (or 3) is for logging.)

bugfix: lib/sh/db.sh: pg_export_table_to_dir_no_header(): inlined $(pg_header) so setting $cols wouldn't affect pg_export_table_no_header(), which uses it as a kw param

bugfix: lib/sh/util.sh: to_file(): require_not_exists check: missing `test` in `if "$if_not_exists"`

lib/sh/util.sh: command(): log the function call using echo_func to assist debugging. (use a higher log_level because it's internal.)

lib/sh/util.sh: command(): support custom redirections, which will be echoed along with the command

lib/sh/util.sh: to_file(): reworded confusing || conditional for require_not_exists into an if statement

bugfix: inputs/GBIF/raw_occurrence_record/run: herbaria_filter.table/make(): need to use append=1 with mysql_import so the output table doesn't get re-truncated when additional parts are added

bugfix: lib/sh/db.sh: load new aliases before mk_select(), which uses mk_table_esc