Add pvlib.temperature.fuentes (#1037)

* add fuentes function

* api.rst entry

* add tests

* whatsnew

* refactor for coverage

* code comments

* notes section

* pandas to numpy

* inoct->noct_installed; copy reference format from sapm_cell

* oops

* fix the things I broke

* expose surface_tilt param; change hydraulic_length to module width and length

* cap0 units

Co-authored-by: Cliff Hansen <[email protected]>

* module_height description; stickler

Co-authored-by: Cliff Hansen <[email protected]>

Author: kandersolar

docs/sphinx/source/api.rst

@@ -237,6 +237,7 @@ PV temperature models
    temperature.sapm_cell_from_module
    temperature.pvsyst_cell
    temperature.faiman
+   temperature.fuentes
 
 Temperature Model Parameters
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~

docs/sphinx/source/whatsnew/v0.8.0.rst

@@ -92,6 +92,7 @@ Enhancements
   PVSystem, LocalizedPVSystem, SingleAxisTracker, and
   LocalizedSingleAxisTracker repr methods. (:issue:`1027`)
 * Added ability for :py:func:`pvlib.soiling.hsu` to accept arbitrary time intervals. (:pull:`980`)
+* Added :py:func:`pvlib.temperature.fuentes` for cell temperature modeling. (:pull:`1037`)
 * Add :py:func:`pvlib.pvsystem.combine_loss_factors` as general purpose
   function to combine loss factors with a common index.
   Partialy addresses :issue:`988`. Contributed by Brock Taute :ghuser:`btaute`