bugfix: schemas/util.sql: col_names(): need to exclude dropped columns (which remain included in the pg_attribute table until the next tuple rewrite), by filtering on `NOT attisdropped`. lib/sql.py table_col_names() is not affected by this because it is able to access the column names from the DB driver directly, after performing `SELECT * FROM table LIMIT 0`.

schemas/util.sql: set_col_names_with_metadata(): don't delete the metadata entries from the map table, because they are now added before the renames take place, so that the renames can simply be performed on the constant columns themselves. this does, however, require that the metadata entries are always listed last in the map.csv (which is currently the case).

lib/runscripts/table.run: map_table(): store the map table in the datasource schema, so that it can easily be referred to when using the staging tables. this also allows it to be found more easily when debugging its contents.

lib/sh/db.sh: psql(): hide the verbose CONTEXT information that is output with each NOTICE by setting the VERBOSITY psql var to terse (postgresql.1045698.n5.nabble.com/Quiet-quot-CONTEXT-quot-td1906036.html#a1906037)

*{.sh,run}: use new log-() instead of log+() with a negative #

lib/sh/util.sh: added log-() because it's non-obvious that you would otherwise have to invoke log+() with a negative #

schemas/util.sql: reset_map_table(): drop the table and recreate it instead of just creating it if it doesn't exist, so that any change to the util.map table is propagated to persistent map tables whenever they are reloaded from the map.csv

lib/runscripts/table.run: map_table(): create the map table as a persistent table in the temp schema, so that its contents can be viewed for debugging

schemas/util.sql: added drop_table()

schemas/util.sql: set_col_names(): don't perform rename if the name is not changing, to avoid cluttering the debug output with unnecessary queries