Add forms for Omega(e,d,q), except when d odd, q even; some cleanup #2577
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Also added a new helper
SetInvariantQuadraticFormFromMatrix
which reduces some code duplication and as a side effect enforces the invariantB = Q + Q^tr
, where B is the Gram matrix of the invariant bilinear form of an orthogonal group G, and Q is the Gram matrix of its invariant quadratic form.The reason for excluding the case where d is odd, q is even, is described in issue #2576