Bugfix/initialise ctmp in collisions

Make sure ctmp is initialised

We need to initialise the receiving buffer in g2le redistibutes as currently our redistribute does not populate every element in the receiver. Presumably this is because these buffers have a dimension negrid+1 whilst the sending layout only has negrid energy points.

Make sure g2le receiving buffer is initialised

Fix bug in check_g2le where we did not loop over the energy dimension