Add (symbolic) Struve functions

[kcrisman]

Apparently Maxima has this.

struve_h (v,z)                 Struve H function
struve_l (v,z)                 Struve L function

See #15024 and the symbolic wiki on Trac for more detail.

Component: symbolics

Keywords: special, holonomic

Author: Ralf Stephan

Branch/Commit: cf92ce3

Reviewer: Karl-Dieter Crisman, Frédéric Chapoton

Issue created by migration from https://trac.sagemath.org/ticket/16221

[rwst]

Branch: u/rws/add__symbolic__struve_functions

[rwst]

Author: Ralf Stephan

[rwst]

Changed keywords from none to special, holonomic

[rwst]

Commit: 03e076a

[rwst]

New commits:

03e076a

16221: implement Struve H/L functions

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

a6a6310

Merge branch 'develop' into t/16221/add__symbolic__struve_functions