Add DirectProductOfPermGroupsWithMovedPoints helper #4326
Merged
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This is basically what DirectProduct does for a set of permutation groups,
except that one can override the moved points for each factor. This is useful
if one needs to compute "sums of G-sets": If e.g. we have a trivial group
acting on 3 points, and a Sym(4), then DirectProduct just gives back the
Sym(4). But if we need the result to act on 3+4=7 points, with the Sym(4)
acting on points acting on [4..7], then this new helper allows us to do that.
For now, I left this deliberately undocumented, as it is quite niche.