Minor bug generates warnings for valid clino readings

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I was processing a survey were clino readings were from an instrument where
a zero reading is straight up. So the calibrate statement is:
*calibrate clino 90.00 -1

The file processes fine, but the log is full of warnings about clino
readings over 90 degrees:
warning: Clino reading over 90 degrees (absolute value)

These readings are not over 90 degrees once the calibration is applied, so
the warnings should be not generated. Presumably a related bug exists where
erroneous readings of less that -90 degrees (after calibration adjustment)
would not generate warnings because the actual value (before calibration
adjustment) is > -90

Footleg