MEANCLIP

       Computes an iteratively sigma-clipped mean on a data set

       Clipping is done about median, but mean is returned.
       Called by SKYADJ_CUBE

       Statistics

       MEANCLIP, Data, Mean, Sigma

       Data:     Input data, any numeric array

       Mean:     N-sigma clipped mean.
       Sigma:    Standard deviation of remaining pixels.

       CLIPSIG:  Number of sigma at which to clip.  Default=3
       MAXITER:  Ceiling on number of clipping iterations.  Default=5
       CONVERGE_NUM:  If the proportion of rejected pixels is less
           than this fraction, the iterations stop.  Default=0.02, i.e.,
           iteration stops if fewer than 2% of pixels excluded.
       /VERBOSE:  Set this flag to get messages.

       SUBS:     Subscript array for pixels finally used.

       Written by:     RSH, RITSS, 21 Oct 98
       20 Jan 99 - Added SUBS, fixed misplaced paren on float call,
                   improved doc.  RSH

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