Separate API and Program#5

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matt-garman wants to merge 3 commits intopadelt:masterfrom

matt-garman:separate_api_program

Commits on Dec 13, 2015

Separate program and USB access code. pcsensor.c reduced to
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remove comments, consistent copyright header, honor debug and calibration cli args, update .gitignore
matt-garman
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consistent formatting
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