Automatic setting of the gml parameter

[jrfaeder]

Currently, the default value is pretty low and NFsim refuses to increase the value but instead exits with an error indicating that the user needs to set to an increased value using the gml flag. When running from BNG, this can be confusing because the user has to figure out where to find the documentation (Actions and Arguments is one place) that indicates how to do this from BNG. It's actually very simple, just add the parameter gml=>int to the parameter list of simulate, but it's a nuisance. This could be done automagically.