exc.py: e_msg(): Run strings.ustr() on the returned string so it will be appendable to other Unicode strings

exc.py: Added e_msg(), e_str() (from SQL py_functions._date())

db_xml.py: put_table(): Adding fkey to parent: Fixed bug where should only add parent_ids_loc table to list of tables not to truncate if it's a column, because it is sometimes just a pkey value when that iteration contained only literals

inputs/import.stats.xls: Updated with stats from latest import

inputs/import.stats.xls: Corrected date of last import

sql_gen.py: plpythonu_error_handler: Fixed bug where PL/Python exceptions could not be filtered by strings after the first line, because only the "message" portion of the exception is available in SQLERRM

schemas/py_functions.sql: _date(): YMD parsing: Fixed bug where exception for ValueError needed to be stored in local var so its message could be parsed

sql_gen.py: plpythonu_error_handler: Always raise PL/Python exceptions as data_exception so they go in the errors table, instead of aborting the iteration

sql_gen.py: plpythonu_error_handler: Fixed bug where not all PL/Python exceptions start with "PL/Python: " (e.g. on PostgreSQL 9.1 on vegbiendev), so the PL/Python prefix must be optional. Refactored to put IF clause for non-PL/Python exception at end for a more logical ordering of the conditions.

Added inputs/CVS/