Make sure that bash script creates a FAIL in Jenkins.

See merge request !466

Debug interactions

See merge request !443

Check that both input files have logged the same number of neighbours and make sure that the neighbour lists are long enough.

If the neighbour count goes above NUM_OF_NEIGHBOURS don't log the neighbour id but keep logging the neighbour count.

If the neighbour count goes above NUM_OF_NEIGHBOURS don't log the neighbour id but keep logging the neighbour count.

Bash script to check the number of particle interactions between naive, serial and vectorised versions of the code.

Conflicts:
	src/hydro/Gadget2/hydro_io.h