scrl(num)
  
	Class Public methods
	Scrolls the current window Fixnum
num lines. The current cursor position is not changed.
For positive num, it scrolls up.
For negative num, it scrolls down.
Scrolls the current window Fixnum
num lines. The current cursor position is not changed.
For positive num, it scrolls up.
For negative num, it scrolls down.
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