Provided to allow subclasses to construct an ElementalLoad object
associated with the Element whose unique identifier in the Domain will
be elementTag. The integers tag and and classTags
are passed to the Load constructor.
Provided so that a FEM_ObjectBroker can construct an object. 0 and
classTag are passed to the Load classes constructor. The data
for the object is filled in when recvSelf() is invoked on the
object.