GENER Tweaks

[ptomasula]

Related Issue(s):
respec/HSPsquared #57

Problem(s):

1. The Gener class did not apply scaling factors specified in the NETWORK block when inputting timeseries into a Gener class instance. Though this is not a feature used in our GLWACSO test case, not including this functionality was an oversight and would need to be added in longer term.
2. The Gener class raises NotImplementedError exceptions when trying to access an unsupported feature (e.g. loading data from a RCHRES as seen in test10). This unhandled exception causes the main function to stop executing. Suggested that we add logic upstream to handle exceptions and warning users of issue rather than stopping model execution.

Solution(s):

1. Added logic to apply MFACTOR (when specified) to values read from a Copy or Gener class instances within the Gener.init method. See commit 399e861
2. Added Try Except block to handle NotImplementedError exceptions within main.py's main function. The except block now prints a warning to console that a Gener instance is trying to use unsupported features and may cause model execution errors. See commit 60e76ea