scrolling.

scrolling.
uses Wscreensize() to get screen size.
More intelligent framing.
etc.

SCCS-vsn: usr.bin/window/wwiomux.c 1.5
SCCS-vsn: usr.bin/window/wwspawn.c 1.5
SCCS-vsn: usr.bin/window/wwinit.c 1.5
SCCS-vsn: usr.bin/window/wwmisc.c 1.6
SCCS-vsn: usr.bin/window/wwopen.c 1.5
SCCS-vsn: usr.bin/window/wwputc.c 1.5
SCCS-vsn: usr.bin/window/wwputs.c 1.5
SCCS-vsn: usr.bin/window/ww.h 1.5
SCCS-vsn: usr.bin/window/cmd.c 1.4
SCCS-vsn: usr.bin/window/cmd1.c 1.4
SCCS-vsn: usr.bin/window/wwtty.c 1.4
SCCS-vsn: usr.bin/window/wwwrite.c 1.4
SCCS-vsn: usr.bin/window/cmd2.c 1.4
SCCS-vsn: usr.bin/window/wwsuspend.c 1.4
SCCS-vsn: usr.bin/window/wwprintf.c 1.4
SCCS-vsn: usr.bin/window/cmd3.c 1.3
SCCS-vsn: usr.bin/window/wwgets.c 1.3
SCCS-vsn: usr.bin/window/wwclose.c 1.3
SCCS-vsn: usr.bin/window/wwframe.c 1.3
SCCS-vsn: usr.bin/window/wwlabel.c 1.3
SCCS-vsn: usr.bin/window/defs.h 1.3
SCCS-vsn: usr.bin/window/cmd4.c 1.3
SCCS-vsn: usr.bin/window/cmd5.c 1.2
SCCS-vsn: usr.bin/window/startup.c 1.2