stepcompress: Always return 0 on negative number in safe_sqrt()

sqrt() of a negative number in the C code returns NaN.  This value
results in behavior that is difficult to debug.  Always return 0.0
instead as this results in better behavior that is easier to track
down.  Also, on some code paths, safe_sqrt is called on numbers that
are multiplied by very large amounts (eg, 16000000**2) and thus
distinguishing between large and small negative numbers is difficult.
For now, report in the log if the value is below -0.001.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

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