DEV: Created func to scrape default param values during autowrap
DEV: Created func to scrape default param values during autowrap

Function is called _default_vals.
This fuction will be used by the function define_input_ports when
functions are being autowrapped into VisTrails objects.

giltis/VTTools,giltis/VTTools,Nikea/VTTools,Nikea/VTTools