Hashcode and equals in Eventable now also take source and target into account.

Fixes #155
Merge branch 'fixes/155-fix-elements-without-interactions' into fixes/241-candidate-position-out-of-place
Deleted temporary test
Removed more debug stuff
Position is correct again.

This fixes #241
Merge branch 'fixes/155-fix-elements-without-interactions' into fixes/241-candidate-position-out-of-place