Commits on Jun 24, 2019

1. lib: improve error handling for Image, ... …

   ..., `Images`, `PreImage`, and `PreImages`.
   
   If one of these functions figures out that the second argument is not an
   element or subset of the Range or the Source, it now tells the user.
   The same changes are replicated to `hpcgap/lib/mapping.gi`.
   
   Improves the structuring of the `mapping.tst` file. Adds tests for the
   new error handling.
   
   Also adds some general tests for `Image`, `Images`, `PreImage`,
   `PreImages`.

   

   ssiccha committed Jun 24, 2019
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