SYNOPSIS
mixed sort_objects( object *obs, string lfun closure sortfun, mixed extra)
FILE
/kernel/simul_efun/array.h
DESCRIPTION
Sorts an array of objects after the result of an lfun in each of them. The
comparing function must be given as a closure, the lfun as a string.
Additionally an extra argument can be given which will be passed to the
lfun