sql.py: DbConn.do_autocommit(): Output the "Autocommitting" debug message with level=4 so that it doesn't clutter up the logging output for normal verbosities

DbConn: autocommit mode defaults to True so that all scripts get the benefit of automatic commits

input.Makefile: Staging tables: import/install-%: Include the table name in the log file name so that successive tables for the same datasource don't overwrite the same log file

sql.py: DbConn: Don't always autocommit in debug_temp mode, because this could cause autocommit mode to be turned on when the user does not expect it

bin/map: connect_db(): Autocommit in commit mode to avoid the need for manual commits. This should also reduce the time that table locks are held, to avoid unnecessary contention when multiple processes are trying to insert into the same output table. (The program always uses nested transactions to support rollbacks, so there is no problem autocommitting whenever a top-level nested transaction or top-level query completes.)

sql_gen.py: Removed TempFunction because that functionality is now provided by DbConn.TempFunction()

sql.py: Use new DbConn.TempFunction()

sql.py: DbConn: Added TempFunction()

sql.py: Use new DbConn.debug_temp config option to control whether temporary objects should instead be permanent

sql.py: DbConn: Added config option debug_temp