Add domains for permutation groups

[mwhansen]

Often, one wants to define a permutation group on a set other than {1,2,...,n} such as say {'a', 'b', 'c', 'd'}.

For example,

sage: G = PermutationGroup([ [('c','d')], [('a','c')] ])
sage: G.orbit('a')
['a', 'c', 'd']

Apply:

1. attachment: trac_10335-permgroup_domain-rebase.patch

Depends on #10334

CC: @sagetrac-sage-combinat @sagetrac-jasonbhill @rbeezer @jdemeyer

Component: group theory

Keywords: sd31

Author: Mike Hansen, Jason Hill, David Loeffler

Reviewer: Robert Miller, Rob Beezer, Nicolas Borie, Nicolas M. Thiéry

Merged: sage-4.7.2.alpha3

Issue created by migration from https://trac.sagemath.org/ticket/10335