Function:     irim_cutlist

Purpose:      cuts a list to the requested length

Category:     IRAS, private to program: IMAGE

Author:       Do Kester

Use:
void irim_cutlist(
	list_type	*ls,
	int		length )

returns: -1	out of memory
	 other	length

Comment:      This routine is not callable in FORTRAN

Updates:      06 Aug 1991: DK, Creation date
	      04 Jun 1992: DK, prepared for GIPSY library
	      22 Aug 1995: DK, realloc returns a void* which has to be filled