Make FiniteElementBase subscriptable but not iterable
#180
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Addresses #179. This changes makes
FiniteElementBaseraise an error when__iter__is called, so that Python does not treat it as an iterable object.In addition, it appears that the use of
NotImplementedinFiniteElementBase.__getitem__may be inappropriate since (I think)__getitem__is not one of the binary operations for whichNotImplementedis intended, so it is replaced with aKeyErrorwhen an invalid restriction is supplied.