bin/map: Added new verbose_errors mode, enabled in test mode and off otherwise, which controls whether the output row and tracebacks are included in error messages. Having this off in import mode will reduce the size of error logs so they don't fill up the vegbiendev hard disk as quickly.

exc.py: print_ex(): Added detail option to turn off traceback

bin/map: Turn parallel processing off by default. This should fix "Cannot allocate memory" errors in large imports.

bin/map: in_is_db: Don't cache the main SELECT query

bin/map: by_col: Use the created template, which already has the column names in it, instead of mapping a sample row

bin/map: Fixed bug where db_xml could not be imported twice, or it was treated as an undefined variable for some reason

bin/map: map_table(): Make each column a db_xml.ColRef instead of a bare index, so that it will appear as the column name when converted to a string. This will provide better debugging info in the template tree and also avoid needing to create a separate sample row in by_col.

db_xml.py: Added ColRef

bin/map: Fixed bug where row count was off by one if all rows in the input were exhausted, because the row that raises StopIteration was counting as a row

main Makefile: VegBIEN DB: mk_db: Use template1 because it has PROCEDURAL LANGUAGE plpgsql already installed and we aren't using an encoding other than UTF8