exc.py: str_(): Avoid traceback exception-formatting functions when possible because they escape non-ASCII characters

sql.py: get_cur_query(): If no raw query: Use strings.ustr() instead of repr() to ensure that if the exception is parsed, embedded quotes will not be double-escaped. Prefix the query by [input] to show that it's not the raw query.

sql_gen.py: Non-Code objects: str() passes informative placeholder string to self.to_str() instead of empty string

sql.py: ExceptionWithNameValue: Use repr() instead of strings.ustr() on the value

sql.py: run_query(): Exception parsing: Use non-greedy qualifier "?" in regexps wherever possible to avoid matching closing quotes later in the error message

sql_gen.py: MockDb.esc_value(): Use repr() instead of strings.ustr() so the quotes around the value are included

sql_gen.py: ValueCond and Join class hierarchies inherit from objects.BasicObject like Code does

sql.py: put_table(): ignore(): Fixed bug where value needed to be filtered through repr(). NullValueException: Fixed bug where value passed to ignore() was the string 'NULL' instead of the value None.

mappings/DwC2-VegBIEN.specimens.csv: plantname.rank: Filter through _toTaxonrank

sql.py: put_table(): ignore(): Avoid infinite loops by asserting that in_col is not in conds