Initial attempt at upward cascade for getting an attribute from parent object.
Model, Experiment, and Variable __init__ calls require a 'parent' argument and use it to set the 'parent' attribute.
Added skeleton file, apc524proj.py, for the Project object we will use to test the module and changed main.py to incorporate it.
Added master variable list.
Encapsulate meat of main.py into a function; prevents it from going into the __main__ namespace scope.
Comment in apc524proj.py about testing with Project-specific and master-list Variables.
Added skeletons of SuiteOfCalc functions currently in main.py.