https://github.com/sympy/sympy/wiki/Release-Notes-for-1.6

Related:

• Last update: Update sympy to 1.5 #28911 - Update sympy to 1.5
• package symengine and its Python interface #29497: package symengine and its Python interface

CC: @kiwifb @timokau @saraedum @slel @antonio-rojas @videlec @isuruf

Component: packages: standard

Author: Antonio Rojas

Branch/Commit: 1734209

Reviewer: Matthias Koeppe, Isuru Fernando

Issue created by migration from https://trac.sagemath.org/ticket/29730