Start of an element cache in sim/ to hold elements that may or may not be used in any given simulation
Cleanups
Create 'ATOM_CATEGORY' concept; e.g., P3Atom -> ATOM_CATEGORY = 3
Expand UUID to encode CoreConfig template parameters; update tests
Misc tweaks and mopups
Missed one..
Merge pull request #33 from DaveAckley/master

Beginning of centralization of element registration and loading