Fix wrong use of array copy

Slang has a natural copy mechanism of the form array_a[[0:n]] = array_b[[m:m+n]]
and copies the entries for natrual types accordingly. However if array_a
is of type Array_Type it sets *all* indices to array_b[[m:m+n]].

We have to copy each element individualy to do it correctly.

Also removed a print statement used for debugging.