removed redundant const_constraint;
add_const_constraint: proper certification;
prepare_dummies: avoid imperative features;
term_check: separate phases, standard_infer_types passes inference parameters instead of frees/vars;
Syntax.install_operations: dummy unparsers;
#!/usr/bin/env bash
#
# $Id$
#
# psbooklet - rearrange pages of ps file to be printed as booklet (duplex)
#
psbook "$@" | \
pstops '4:0L@.7(21cm,0cm)+1L@.7(21cm,14.85cm),3R@.7(0cm,14.85cm)+2R@.7(0cm,29.7cm)'