Extended versions of spherical harmonics Ynm
Add spherical harmonics to doc and autoimport
Fix doctests
Fix real spherical harmonics definition
Make the real-valued spherical harmonics Znm a first-class function
Fix test args failures
Small doc fixes
Fix errors in docstring of Ynm
Add multi-precision evaluation of Ynm
Latex printing for Ynm and Znm
Tests for latex printing of Ynm and Znm
Address some review comments
Add rewrite(cos) to spherical harmonics
Add rewrite(sin) to spherical harmonics
Tests for new spherical harmonics functions
Adapt docstring to new simplify results
Remove old spherical harmonics code

Conflicts:
	sympy/functions/__init__.py
Fix left over imports of old spherical harmonics
Adapt spherical harmonics benchmark to new function name
Remove some more old imports