movement speed in movement tests are no longer hardcoded.
vehicles explode when they have no valid exit path.
Group function incl tests.
Resolved midje errors.
Reverting "Resolved midje errors."
Revert "Resolved midje errors."

This reverts commit 4054cd346d7d422651414a556f5bbe863a467ca7.
precondition in cell to check for existence of ref.
changes to import to make load-level work.
On bug hunt!