sql.py: DbConn: _savepoint starts at 1 because the driver is not in autocommit mode, so a transaction is already open

sql.py: DbConn: _savepoint starts at 1 because the driver is not in autocommit mode, so a transaction is already open

csv2db: Create errors table first, so that imports can start using it right away

input.Makefile: Added import/steps.by_col.sql to generate a Redmine-formatted list of steps for column-based import

bin/map: Optimized default verbosities for the mode: automated tests should not be verbose, column-based import should show all queries to assist profiling, and row-based import should just show row progress

sql_io.py: put(): Run data import queries with log_level=3.5 so they don't clutter the output at the normal import verbosity of 3

db_xml.py: put_table(): Work around PostgreSQL's temp table disk space leak by reconnecting to the DB after every partition

sql.py: mk_select(): Also support limit and start values of type long

sql_gen.py: suffixed_table(): Fixed bug where needed to copy all table attrs, such as is_temp status

sql.py: create_table(): Fixed bug where needed to run query in recover mode in case the table exists and was created before the current connection, such that the CREATE TABLE statement would not have been cached