[dev-context] scrn-pag.mkiv: Set custom values for the page dimensions

Hi Hans, can you add a command to set own values for \clf_setupcanvas, e.g. \def\scrn_canvas_synchronize_set#1#2% {\clf_setupcanvas paperwidth \dimexpr#1\relax paperheight \dimexpr#2\relax \relax} \let\scrn_canvas_synchronize_reset\scrn_canvas_synchronize_only This is needed for the \pageinjection command when I include larger images which spread over multiple pages. Wolfgang