Call runner_doself1_density_vec in DOSUB_SELF1 if vectorisation is enabled. Changed all WITH_VECTORIZATION macros to WITH_OLD_VECTORIZATION.

Revert "Force a sort of the particles at every time-step for active cells and at reception of data."

This reverts commit 078d450f

No need to check for received unactive cells for the rho communication sub-type. They can't happen any more.

Post repartition we can have cells if a bad state if they have previously been inactive on a rank (so they hold particles, but the cell data do not match)

Also check that all particles are in the correct cell at all levels when checking for h_max and dx_max