Ensure array.copy() does a deep copy

Author: FilipeMaia

arrayfire/array.py

@@ -179,7 +179,7 @@ def __init__(self, src=None, dims=(0,), type_char=None):
 
     def copy(self):
         out = array()
-        safe_call(clib.af_retain_array(ct.pointer(out.arr), self.arr))
+        safe_call(clib.af_copy_array(ct.pointer(out.arr), self.arr))
         return out
 
     def __del__(self):