Jon Trulson 6a6a572069 dfrec: Initial implementation
This module implements support for the DFRobot EC (Electrical
Conductivity) meter.  It relies on the use of the DS18B20 UPM C module
for temperature gathering.

It has a pretty complicated calibration procedure which is somewhat
documented on the DFRobot wiki.  Functions have been added to support
changing the various coefficients as desired.

Signed-off-by: Jon Trulson <jtrulson@ics.com>
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