(1) Moved LED-writing function one step closer to bare metal
(2) Rationalized debug messages (required some reordering)
(3) Changed several int variables into bool's
Merge pull request #2 from PhilipLoewen/noStrings

(1) Move LED-writing function one step closer to bare metal (drop call to c_str() method)
(2) Rationalize debug messages (required some reordering)
(3) Change several int variables into bool's