Quantification fix: 'nonlocal' statements should be generated even if not top-level query.
Quantification fix: 'nonlocal' statements should be generated even if not
top-level query.

* da/compiler/pygen.py(PythonGenerator.visit_QuantificationExpr): generate
  nonlocal statement regardless of whether top-level.

mayli/DistAlgo,sghosh1991/distalgo,mayli/DistAlgo,sghosh1991/distalgo