SYNOPSIS
	mixed unique_array(object *obarr, string seperator)
	mixed unique_array(object *obarr, string seperator, mixed skip)

DESCRIPTION
	Groups objects together for which the separator function
	returns the same value. obarr should be an array of objects,
	other types are ignored. The separator function is called only
	once in each object in obarr. If a 3rd argument is given and
	this argument matches the return value of the separator
	function this object will not be included in the returned
	array. The returned array is an array of arrays of objects in
	the form:
	
	({ ({ Same1:1, Same1:2, ... Same1:N }),
	   ({ Same2:1, Same2:2, ... Same2:N }),
	      ....
	   ({ SameM:1, SameM:2, ... SameM:N }) })

EXAMPLE
	mixed *arr;
	arr=unique_array(users(), "_query_level", -1);
	
	This will return an array of arrays holding all user objects
	grouped together by their user levels. Wizards have a user
	level of -1 so they will not appear in the the returned array.
	
SEE ALSO
	filter_array(E), map_array(E)