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Clarify module_parameters['EgRef'] usage, and set a default value #462

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@cwhanse

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@cwhanse

The CEC module parameters database does not contain the parameters EgRef or dEgdT. In the CEC model, and in the process NREL follows to generate the database from the CEC module data list, values EgRef = 1.121 and dEgdT = -0.0002677 are implicit. PVLib for Matlab exposed EgRef and dEgdT as a model parameter (which it is) and let the user determine the appropriate value. pvlib-python does likewise, however, readthedocs.io examples do not inform the user that s/he must specify EgRef and dEgdT nor do we provide default values when they are not specified.

I propose that we:

  1. assign default values within pvsystem.retrieve_sam('cecmod') and
  2. add to the example at http://pvlib-python.readthedocs.io/en/latest/modelchain.html to illustrate use of the CEC module model, and the opportunity to specify EgRef and dEgdT, if desired.

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