* adding rrc filter, temporarily putting it in utilities.py
* added some docstring stuff
* added a simple loss class for fiber and cleaned up some duplicate convenience access properties
* Changed Carrier to Channel to reflect correct nomenclature for multi-carrier/superchannels
* in process fixes for main.py. adding in amp spacings and spans to convert to start adding additional noded to Coronet network
* some simple additions to utilites
* adding stand alone edfa model