logical function kget_track_is_covar(ktrk)
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*  Returns TRUE if KWFIT track has a covariance matrix
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*  Input Parameters:
*  ktrk           integer variable
*                 KWFIT track number
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*  Output Parameters:
*  None
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*  Return value   logical
*                 TRUE  ==> track has a covariance matrix
*                 FALSE ==> track has no covariance matrix or error
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*  Other routines:
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*  Notes:
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*  Author:   Paul R Avery      Created:  Mon Jul 28 06:12:33 EDT 1997
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*  Major revisions:
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