expanded_numpy: Changed expand_enumerate to use numpy.uint64 by default.
nanshe_learner: Fixes for regionrefs that point to an externally linked file.
neuron_volumina_viewer: Created a mechanism that provides an operator for max projection onto a source. Added MaxProjectionConstantSource and MaxProjectionConstantRequest for dealing with determing the max projection of a constant source (will not change or become dirty) along one dimension.