Improved Indian Icecream

closes #19 (See PR #29)

Indian Icecream

• Fixes #21 - created a contrib folder for examples
• Fixes #25 - add quadratic parameter bRBD to model soft breakdown
• Fixes #20 - change hard coded cell position patterns to realistic examples of TCT and PCT modules

Himalayan Ham

• fixes #17

Himalayan Honey

• fixes issues 11, 12, 13 and 14
• create partial and total crosstied modules
• separate pvcells from pvconstants so that every cell properties can change
• add documentation and testing

German Granola

Fix setup to install all packages together by creating main project package.

• Renamed pvmismatch to pvmismatch_lib
• Move all packages inside new pvmismatch top level package
• Also move package data and documentation into new top level package
• Note: Any imports that use pvmismatch.pvconstants, pvmismatch.pvmodule, pvmismatch.pvstring or pvmismatch.pvsystem will no longer work.
• Instead use from pvmismatch import pvconstants, from pvmismatch import pvmodule, from pvmismatch import pvstring or from pvmismatch import pvsystem
• For convenience you can use from pvmismatch import * to import all four main modules
• Constructors are also exposed to top level package, for example can use from pvmismatch import PVsystem

German Goulash

• fix issue with CalcMPP_IscVocFFeff() was trying to use dP/dV = 0 to get better estimate of Vmp, but this is at most as accurate as simply using the index found from max(Psys), and probably less accurate, also it was using all Vsys, so it would jump to local extrema
• finally add setup.py and create distribution so users can install