Daily Update for July 5th

Only problem with DescStructure right now is that its check method  requires state information it doesn't have access to in order to work.   Mithro suggested that I write a GroupStructure that can encompass DescStructure and the field it needs to determine its structure, and let that Group handle checking. I'll work on that tomorrow, and finish making useparameters work (which I believe will mostly entail making sure I understand their behavior correctly.)