+ comment
adding WIP on use of hardware interrupts to access DMP motion data

Underneath all the waffle - coade is based on core sensor sample + added
use of interrupts using methods in the library.

This sort of works at least one axis, most of time, but there are mnay
issues and endless notes in teh main file adn even several ADDED files
with more notes.....

Feel free to toss this away and start again...