Numpy loops and algos optimisations.

parmepy/new_ParMePy/Domain/CartesianGrid.py

parmepy/new_ParMePy/Operator/AdvectionDOp.py

parmepy/new_ParMePy/Operator/InterpolationDOp.py

parmepy/new_ParMePy/Operator/RemeshingDOp.py

parmepy/new_ParMePy/Utils/Linear.py

parmepy/new_ParMePy/Utils/M4Prime.py

parmepy/new_ParMePy/Utils/M6Prime.py

parmepy/new_ParMePy/Utils/ParticularSolver.py

parmepy/new_ParMePy/Utils/RK2.py