[AlignedNumber] Run the SIMD testsuite.

Jö Fahlkerequested to merge
aligned-number-simd-test into master

Also run the simd testsuite on AlignedNumber, sind it does provide a SIMD abstraction.

Also fixes one issue with that abstraction (though I do not recall why exactly I did not allow const Scalar<T> &lane(T &&), but required the return type to be one of Scalar<T> or Scalar<T>&&).

Closes: #123 (closed).

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