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ENH: WIP: add methods and tests for a explicit IV curve calculation of single-diode model (#409)

* add methods and tests for a faster way to calculate single-diode model

* log estimate of speedup in test

* use ordered dict for output, match inputs and outputs, add iv-curve

* add "slow" but reliable ways to calculate i_from_v and vv

* add slow_i_from_v(v, *x) which uses bishop88 and the canned bisecton
 method from scipy.optimize.fminbound to guarantee convergence
* ditto for slow_v_from_i(i, *x)
* ditto for slow_mppt(*x)
* add slower_way(*x) which is the equivalent of faster_way(*x) but using
 the canned bisection method from scipy.optimize.fminbound instead of
 the generic newtom step method.
* also add some better docstrings and comments

Signed-off-by: Mark Mikofski <bwana.marko@yahoo.com>

* add check for numerical errors

* use float64, output symbols for fun, make executable

* add tests for slower_way using fminbound

test_way_faster
---------------
* change test names to test_fast_ and test_slow to differential
* move tstop before the expansion of output values

way_faster
----------
* refactor to use photocurrent for il, saturation_current for io,
resistance_series for rs, resistance_shunt for rsh, and nNsVth for nnsvt
* remove start of custom newton solver
* fix FIXME to use the correct names

* change voc to v_oc

* add numeric type to args in docstrings

* so that pycharm will stop complaining
* add a bunch of todo's for #408 and #410
* use DELTA instead of recalculating each time
* fix typo/bug in docstring for nNsVth arg, missing trailing colon (:) had
quotes (") instead

* replace custom newton method with scipy.optimize.newton

* remove tol, damp, log, & test args in from faster_way() since not
used anymore
* do not import logging, and remove LOGGER, etc.
* also remove EPS, DAMP, DELTA all not used
* import newton
* add fast_i_from_v() using newton
* remove the entire custom n... (continued)

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