Make getting model file list SBML aware #372
Description
https://github.com/NeuroML/pyNeuroML/blob/development/pyneuroml/utils/__init__.py#L562 -> currently lems/neuroml/sedml aware, but not sbml aware.
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https://github.com/NeuroML/pyNeuroML/blob/development/pyneuroml/utils/__init__.py#L562 -> currently lems/neuroml/sedml aware, but not sbml aware.