Function:     irim_sortuniq

Purpose:      sort and unique list

Category:     IRAS, private to program: IMAGE

Author:       Do Kester		do@guspace.rug.nl

Use:
void irim_sortuniq(
	list_type	*ls )

The items in LIST are sorted ;	Doublets are silently kicked out.
      Two items are deemed the same if they differ by less than
      epsil (  = 0.001 ).

Comment:      This routine is not callable in FORTRAN

Updates:      07 Aug 1991: DK, Creation date
	      04 Jun 1992: DK, prepared for GIPSY library

Original:     IMSORT
	Structured and translated by ASSISTANT II Plus, v1.2