NAME:
  delelem
 PURPOSE:   (one line only)
  Delete one or more array elements from an array
 DESCRIPTION:
 CATEGORY:
  Utility
 CALLING SEQUENCE:
  delelem,array,idx1,idx2
 INPUTS:
  array - Input array (modified)
  idx1  - Index into array for first element to delete
  idx2  - This can have three values:
            negative - delete abs(idx2) elements
            0 - (default), delete just one element
            positive - second index for end of delete
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
 OUTPUTS:
 KEYWORD OUTPUT PARAMETERS:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Southwest Research Institute, 2014/03/06