Power Supply changes

Power supplies for 3.3v AVDD, 3.3v DVDD. and 5V+ have been refactored
and switched around. The new topology consists of a Micrel MIC24085 3A
DCDC converter powering the 1A 3.3v DCDC, the 1A 3,3v LDO, and supplying
up to 1A of 5v to the Arduino header. USB vs DC jack power switching has
been added to the design based on the Arduino Duelinanov design.