Right now a group homomorphism is defined on images of the generator of the group. In gap there are many more ways to define a group homomorphism.
With this ticket a group homomorphism in sage can be created from the one in gap.

CC: @tscrim @soehms

Component: group theory

Author: Simon Brandhorst

Branch/Commit: 21cb664

Reviewer: Sebastian Oehms

Issue created by migration from https://trac.sagemath.org/ticket/26420