Thu Mar 17 23:18:08 EST 2005 rsc
    i picked up 1) and the vlong change.
    i changed 2) so that the mouse can't get out of the scroll bar ever,
    	but kept the boundaries.
    i did not pick up 3) at all.  you might convince me to
    special case clicking on the top line, but changing the
    click semantics is too big a change, and it destroys the
    very nice explanation that 1-clicking a line brings the
    top line to where you clicked, and 3-clicking brings the
    current line to the top.
    
    i changed cols.c so that you can 1 or 3 click in the space
    below the bottom window, in case the mouse ends up there 
    after a 2-scroll.