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These attributes were misleading: the "dimension" of a groups is not normally defined as the dimension of some space it acts on (here: the dimension of the projective space plus 1 is used, i.e. "the size of the matrices" to quote a code comment).
I don't expect this PR will work in its current form (in particular I did not try to adjust any examples yet). It is of course also rather radical in that it just removes the code. It could instead just rename the attributes, or do something yet different. I mostly wanted this as a starting point for a possible discussion on what to do.