gap-system / gap / 9950

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Show a warning when GroupWithGenerators called on a group

In GAP <= 4.9, the following undocumented use of GroupWithGenerators
was possible:

    gap> GroupWithGenerators( Group( (1,2) ) );
    Group([ (), (1,2) ])

This does not work in GAP 4.10.0, and #3095 restored this never documented
behavior to avoid regressions in code that used to work previously.

This commit adds a warning when such use of `GroupWithGenerators` is detected.

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