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When the graph display is paused, leaving the mouse stationary over
the graph will display the data point under the pointer.
* grapher/CairoWidget.hxx (CairoTextBox): new class
(CairoWidget, CairoPlayButton): refector some play button-specific
things from CairoWidget to CairoPlayButton.
* grapher/CairoWidget.cxx (CairoTextBox::draw): new function.
* grapher/GraphWidget.hxx (GraphWidget): new members for supporting
hover text.
* grapher/GraphWidget.cxx (on_motion_notify_event): Set up hover text box.
(establishHoverTimeout, onHoverTimeout, getGraphUnderPoint): new functions.
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