(deprecated) Read image and calibrate
Filename of the graphic to read
deprecated. Called for side effect of user locating points. See 'graphics::locator' for more. Usage explained at http://lukemiller.org/index.php/2011/06/digitizing-data-from-old-plots-using-digitize/
'calpoints' List of the x and y coordinates of the calibration points
## Not run: ReadAndCal(fname)
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