Brand new pynac has:

• Stieltjes constant function (implement symbolic Stieltjes constants #19834)
• zeta expansion at 1 using stieltjes() (expansion of zeta using stieltjes-constants #19836, thanks Benjamin Hackl)
• fix hashing of infinities (doctest fix for infinities break the hash contract #19928)
• fix exp and atan of oo (doctest fix for: substitute exp(-x) with x infinity fails #19918)
• fix pseries print order
• speedups and fixes from GiNaC

Tarball: https://github.com/pynac/pynac/releases/download/pynac-0.6.1/pynac-0.6.1.tar.bz2

CC: @behackl

Component: packages: standard

Author: Ralf Stephan

Branch/Commit: 8a9b6ac

Reviewer: Benjamin Hackl

Issue created by migration from https://trac.sagemath.org/ticket/19948