NAME:
   stats
 PURPOSE: (one line)
   Compute and print statistics plus plot histogram of data.
 DESCRIPTION:
   This computes basic statistical information regarding the input data and
   prints it to the screen.  It is intended for purely interactive work,
   use MOMENT if you want to save the results to a variable.
 CATEGORY:
   Numerical
 CALLING SEQUENCE:
   stats,data
 INPUTS:
   data - Input data (any rank, or type).
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
  NBINS  - number of bins for histogram (default = 750)
  ROBO   - If set, compute robust statistics.
  SILENT - If set, supresses printed output to the screen
  TITLE  - Title for plot (default is blank)
  XTITLE - X-axis title for plot (default is 'Data Numbers')
  GAUSSIAN - Flag, if set will overplot a gaussian on the histogram
  WINDOW - Window number for plot (default=current)
 OUTPUTS:
 KEYWORD OUTPUT PARAMETERS:
  MEAN   - Optional return on mean of sample.
  IDX    - position of bins
  HIST   - histogram values
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Lowell Observatory, 1993/5/14
  1993/09/23, MWB, Added ROBO keyword
  1995/01/12, MWB, Added SILENT keyword
  1995/03/29, MWB, Augment plot to include mean and sigma annotation.
  1996/07/15, MWB, Added MEAN keyword
  2004/07/08, MWB, Added NaN exclusion for non-robust statistics
  2008/04/09, MWB, added CHARSIZE keyword pass through to plot
  2010/11/29, MWB, added WINDOW keyword
  2015/11/23, MWB, changed plot colors to make background white and
                      foreground black.
  2016/08/18, MWB, added IDX and HIST output keywords