Rhs2116 stimulus sequence shows channel numbers above the 32-channel range

[bparks13]

First referenced here, the Rhs2116 stimulus sequence dialog shows channel numbers above the listed 32 channels, and includes dashed lines for them. This is not the case below the channel range, as we have ZedGraph cut off the y-axis labels below the last channel. The quirk with ZedGraph is that we cannot easily do this operation on both sides.

This was not a consideration until recently, as we used to restrict the viewport to only show these 32 channels, but as of #497 we no longer are restricting this view, which leads to being able to see the labels above the valid range.

Is this worth working on? Should we leave it as-is?