(from #30611)

Released Oct 8, 2020. https://igraph.org/

the previous update was in #27597, where we also disabled blas/lapack inteface; perhaps it can make a comeback here.

This ticket also adds package texttable version 1.6.3, a dependency of python_igraph.

source tarballs: see checksums.ini

Upstream: Reported upstream. No feedback yet.

CC: @kiwifb @dcoudert @dimpase @slel @isuruf

Component: packages: optional

Author: David Coudert, Dima Pasechnik

Branch: 938d704

Reviewer: Dima Pasechnik, Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/30899