established TopFarmGroup class for integrated optimization
created example_4_integrated_optimization_aep_and_irr.py

fixed pep8 and iir-example

Introduced Penalty Component
Various updates to facilitate the modular approach

fixed penalty function

fixed failing tests

fixed more failing tests

updated fuga/recorder tests to account for the new structure and increased number of elements in the recorder.

upd. the input keys

improved coverage