Use AVX2 in IterativeFullJonesSolver::AddOrSubtractDirection
Use aocommon::Avx256::MatrixComplexFloat2x2 in AddOrSubtractDirection, similarly to its existing usage in SolveDirection.
On node512 in DAS-6, the run time of the solvers/iterative_full_jones and solvers/iterative_full_jones_dd_intervals tests decreased from ~9.4 seconds to ~6.7 seconds.
In the unit-test-2204 job on CI, the run time of these tests dropped from ~240 seconds to ~110 seconds!
Edited by Maik Nijhuis