#51 Connector module substitution

[Tyler Stigen]

Many of our models are tested using a virtual neuron module. The ability to swap a module and all of its connections would be a great feature. That way you don't need to rebuild a setting file for use the a real neuron, you can just swap out "GACell:Vm" for "Analog Input 0" and all the connections in the connector would change too.

[Risa Lin]

As I think about the best way to implement this, you can always do a find/replace on a settings file to quickly do this.