WWU_MAJOR, clreol in wwupdate(), and more optimizations.

WWU_MAJOR, clreol in wwupdate(), and more optimizations.

SCCS-vsn: usr.bin/window/wwinit.c 3.12
SCCS-vsn: usr.bin/window/ww.h 3.21
SCCS-vsn: usr.bin/window/wwwrite.c 3.14
SCCS-vsn: usr.bin/window/cmd2.c 3.14
SCCS-vsn: usr.bin/window/wwframe.c 3.12
SCCS-vsn: usr.bin/window/wwlabel.c 3.10
SCCS-vsn: usr.bin/window/wwredraw.c 3.5
SCCS-vsn: usr.bin/window/wwadd.c 3.7
SCCS-vsn: usr.bin/window/wwdelete.c 3.11
SCCS-vsn: usr.bin/window/wwclreol.c 3.11
SCCS-vsn: usr.bin/window/wwinschar.c 3.12
SCCS-vsn: usr.bin/window/wwunframe.c 3.12
SCCS-vsn: usr.bin/window/wwupdate.c 3.9
SCCS-vsn: usr.bin/window/wwdelchar.c 3.9
SCCS-vsn: usr.bin/window/wwscroll.c 3.11
SCCS-vsn: usr.bin/window/wwredrawwin.c 3.8
SCCS-vsn: usr.bin/window/wwcursor.c 3.5