[Matrix-SIG] A fix to recover old behavior for 1.12beta

[Travis Oliphant]

This fix recovers the old behavior for rank-0 arrays (i.e. operations
returning rank-0 arrays are converted to Python scalars---again, I don't
think I like this behavior, though).

Added:

	def _arrayret(self,val,copy=0):
	    if isarray(val):
	       return self.__class__(val,copy)
	    else:
               return val

to the Array class

and replaced self.__class__ with self._arrayret in the class.

--Travis