Fixing naming.
Adding a startup printout for restarts.
Cleaning up code and comments.
Fixing configuration error.
Redesigning RTC to be based on timer overflow interrupt.

1. Updating board definitions with additional interrupt service routines.
2. Using overflow interrupt to allow each porting to other processors.
3. Fixed problem with 8 MHz timing.
4. RTC::millis() is somewhat more expensive operation.
5. RTC::seconds() uses it own delta tick counter.