Symbolic spherical harmonic

[eviatarbach]

This ticket is for making spherical_harmonic a symbolic function.

CC: @burcin @kcrisman

Component: symbolics

Author: Eviatar Bach

Branch: 8588d16

Reviewer: Jan Keitel, Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/15017

[eviatarbach]

Attachment: trac15017.patch.gz

[eviatarbach]

comment:1

Patchbot apply trac15017.patch

[eviatarbach]

comment:2

Attachment: trac15017_2.patch.gz

New patch gets coverage to 100% and fixes an issue in _eval_.

Patchbot apply trac15017_2.patch

[rwst]

comment:6

Patch does not merge.