createTemperatureLookupMarlin.py: Add resolution comments and format for...

createTemperatureLookupMarlin.py: Add resolution comments and format for Marlin.

This formats the output more like the existing thermistortables.h output, replacing the hard-coded *16 oversampling with *OVERSAMPLENR.  This might make it easier to calibrate some table to your actual pullup resistor, thermistor, and measured temperatures.

Note that the output casts the value to a short after multiplication by OVERSAMPLENR in order to not discard resolution.

The Steinhart-Hart coefficients (http://en.wikipedia.org/wiki/Steinhart%E2%80%93Hart_equation) used the calculation of the values are also printed in the comments.

It also adds per-line comments detailing the resistance, voltage, and resolution of the thermistor in degreeC/count.  The resolution data might help those that might want to tune the pullup resistor to tradeoff resolution for accuracy in a region of interest.

https://github.com/ErikZalm/Marlin/issues/105 is related.