FullPivLU and QR refuse to solve for non square matrix
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Description
The [doc](https://www.nalgebra.org/decompositions_and_lapack/) says that LU will only solve for square matrix but that both FullPivLU and QR should work for non-square matrices.
In practice there is an assert in both [implementations of solve](https://docs.rs/nalgebra/0.19.0/src/nalgebra/linalg/full_piv_lu.rs.html#186-211) to insures the methods fails on non-square matrices.
Is it because the implementation of FullPivLU and QR is not able to deal with non-square matrix yet or is it a copy-paste error (in which case I can submit a PR) ?
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