several patches that mean a dramatic power reduction while in idle/armed + neutral#102

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msperl wants to merge 11 commits intosim-:masterfrom msperl:simk-master-sleep

+1,193-22

Commits on Oct 31, 2015

implemented idle sleep
msperl
committed

Commits on Nov 2, 2015

use common macros to set INT0 edge
msperl
committed

Commits on Nov 3, 2015

Commits on Nov 4, 2015

sample ADC channels on a regular basis and oversample the result
msperl
committed

Commits on Nov 11, 2015

added NTC transformation and inlined the scaling/offset code
msperl
committed