sql.py: DbConn.run_query(): Put a newline before the query in the debug message so that multiline queries have all rows at the left edge rather than the first row prefixed by other text

sql.py: DbConn.run_query(): Don't put generated query debug message all on one line, so that embedded newlines are preserved

sql.py: Fixed bug where queries with versioned identifiers which threw an exception (not related to name collisions) were being output with a too-high log_level, because all exceptions were output with the higher exc_log_level, by making the following changes: DbConn.run_query(): Changed exc_log_level param to log_ignore_excs param so that only certain exceptions would cause the query to be output with a higher log_level. Moved the code that actual emits the query debug message from DbConn.run_query() to module-level run_query() so it would apply the log_ignore_excs filter after the exception had already been parsed into specific types.

Moved "Putting columns" debug message from db_xml.py put_table() to sql.py put_table() to put it in the same place as the other debug messages

sql_gen.py: Added remove_col_rename() and use it where `if isinstance(value, NamedCol): value = value.code` was used

sql_gen.py: CompareCond.to_str(): If left_value has been renamed as a NamedCol, unwrap it

sql_gen.py: Join.to_str(): Fixed bug where USING should be used if all columns are join_same_not_null, rather than join_same, because USING uses plain = for comparison. sql.py: put_table(): input_joins now can use sql_gen.join_same_not_null in order to use USING syntax.

db_xml.py: put_table(): Output debug messages with a level of 1.5 to match sql.put_table()'s level for summary messages

bin/map: Fixed bug where verbosity needed to be 1 outside of test mode so that profiling and errors stats would be printed at end of import. Verbosity defaults to 0.5 rather than 1 in test mode so profiling and errors stats do not clutter up the test output when running automated tests.

bin/map: Only display verbose_errors in test mode, but with any nonzero verbosity. They should not be displayed outside of test mode because verbose errors make the log files huge.