Do not clear the sort flag when receiving parts after the ghost.

Implements #304 (closed). We only reset the c->sorted flag for the first receive not for the second one.

LGTM, didn't know that this function was called for both recv_xv and recv_rho!

Yes, sadly we need to update first ti_end_min and the second time h_max.

Status changed to merged

mentioned in commit b4cbd031

mentioned in issue #304 (closed)