[Lazarus] TAchart multiple reticules and vertical series alignment

[Rick]

Alexander Klenin wrote:
> so I implemented it now -- see TConstantLineDragTool
> and toolsdemo at r25751
>   
I just checked it out and played with the demo.
WOW!  I like :)  The tools add-on was a brilliant idea, if these recent 
tools are any indication.

I tried vertical and horizontal lines, which worked great.  Adjusted the 
zorder of the line series
so it would draw on top of the bar graph.

I am concerned about one thing, though:  It looks like the tool will 
move ANY TConstantLine series
on the chart.  I would suggest a property in the drag tool that is a 
list of movable lines.  Perhaps
if empty, the default could be to move all TConstantLine series.  What 
do you think?