Report negative of fitted velocity error when there are not enough pairs of consecutive lags to satify initial omega high/low error estimate. Using the negative value flags the error estimate as suspect, but without fitted error estimate information
signing off on this commit after the fact

Signed-off-by: Jef Spaleta <jspaleta@fedoraproject.org>
signing off on this commit after the fact
Merge pull request #1 from SuperDARN-DA-WG/fitacf-velerr-fix

Report negative of fitted velocity error when high/low omega error is large.