sql.py: add_col(): Support additional run_query() kw_args. add_row_num(): Use new add_col().

sql.py: Added add_col()

sql_gen.py: Col.__str__(): Truncate any table name using concat() to ensure that the full column name is included in the string

strings.py, sql_gen.py: Renamed add_suffix() to concat() to reflect that this is a fixed-length replacement for +

sql.py: put_table(): Moved MissingCastException to the top of the exceptions list because it's more of a core exception than the others, and will be raised before any rows are even inserted

sql.py: DbConn.with_savepoint(): Always release savepoint, because after ROLLBACK TO SAVEPOINT, "The savepoint remains valid and can be rolled back to again" (http://www.postgresql.org/docs/8.3/static/sql-rollback-to.html). Moved `self._savepoint -= 1` to the main try block's new finally block.

sql.py: put_table(): Lock output table right before, and in the same nested transaction as, the insert statement that needs lock, so that it is not released in a prior autocommit and is held for as little time as possible

db_xml.py: put_table(): Removed no longer needed commit param

bin/map: Removed rollback() call before closing the connection because PostgreSQL does this automatically

csv2db: Log inserts with log_level=5 so they are not shown for verbosity 4, which is used to see the savepoints and autocommits