Merge pull request #34 from DaveAckley/master

Doxygen, spacing, ElementRegistry
mfmc driver shows GUI specific behavior, like adding atoms to toolbox
Icons are all 'labeled for reuse with modification'. Added image sizing script.
Background radiation
Pre-merge commit, working on UUID loading
Move elements; make element type non-const; merge
Button names attempt
Warn instead of dying on bad dirs
Catch MQBar up with element type changes