Add Pvsamv1 system design functions

[dguittet]

There are automated system design functions for Pvsamv1 in HOPP that should be imported into PySAM for broader use. The equations enable changing the size of the system by automatically calculating the system configuration (e.g. number of modules, number of inverters, etc).

The main entry to the function that provides a valid module + string + inverter config in order to suit a desired size is here: https://github.com/NREL/HOPP/blob/1fb1e5d6261d2db1ccd54de8bf67cbaacfcd0945/examples/Detailed_PV_Layout/detailed_pv_layout.py#L110

This file contains all the helper scripts: https://github.com/NREL/HOPP/blob/1fb1e5d6261d2db1ccd54de8bf67cbaacfcd0945/hybrid/layout/pv_design_utils.py

Test showing their usage: https://github.com/NREL/HOPP/blob/1fb1e5d6261d2db1ccd54de8bf67cbaacfcd0945/tests/hybrid/test_layout.py#L184