Added ArrayUtils to check whether arrays are equal.
With the strongly emphasis to use this function instead of
time-bomb-coding that converts arrays into strings like:
 array1.join() === array2.join()  => NEVER USE THIS!! this is forbidden

These string ops are nearly 100 times SLOWER than doing it the proper
way, and will actually fail with array entries that contain
commas i.e. like "abd,def".