Fixes, better attention to detail for member masks.
Some fixes and enhancements for the code processing membership mask specifications. This also improves the Exodus bridge to include the true embedding dimension of the model (obtained from the reader), both directly and in the dimension bits of boundary and domain groups. This in turn causes more precise descriptions of the groups and gets the CMBv4 hydra template working so that only groups of the proper dimensionality appear as available. Finally, it improves the method by which the qtAssociationWidget obtains its list of available entities. Iterating over subphrases is not an efficient (nor guaranteed accurate) method for obtaining all of the entities available.