TMS Firing Range

TMS now fires in ranges.  Either an intensity 0,2 or 4 higher when firing high, or lower when firing low.  Added in a few comments for clarity and adjusted the safety range.
I think the intensities aren't in percentages.  You might want to double check the documentation (See the PDF in the repo).  

Either way, this label (and other comments) should state "percentage points" rather than just "percent".