implement new type: %%, given min,cur,max print the value in %%.

also accepts -= and += to adjust the value.
implement new flags: INIT, DEAD.
init means to prefetch the variable before setting, where
dead means to assume the variable is not implemented
(enottty was observed, most likely), set by the low-level
routines (upon observing the ioctl results).
add the variables for screen brightness,contrast,backlight --
all are precent-type, also rework the display.c to be easier
on the eyes. requested, commented and helped upon by miod@ and drahn@.
there was a discussion on wheather truncate or round
(the thin and think ends of the same egg) where
decided to allow it to truncate until demanded
otherwise by the eager masses.

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