Makes String accept unicode again

402c6d2d made String.translate_to_python() only accept 'str' objects,
raising on 'unicode'. This fixes it, although only ascii is safe at this
time.
Fixes imports in parallelflow/map.py
parallelflow: Fixes formatting of an error message
Removes 'nologger=True' from spawned_startup.xml

Removed because it breaks ParallelFlow.