ProjectionObsever now responds to selection changes....* Scatterplot: small fix to selection updates
* ProjectionObserver: whenever CP selection changes, compute
influence of CPs over all RPs. Whenever RP selection changes,
compute influence of RPs by all CPs.
* ProjectionObserver: with empty selections, go back to normal mode
Scatterplot & BarChart: initial brushing mechanism....* Both components now support brushing (support in Scatterplot for
activating a brush is still incomplete, though it can be brushed
on by other components)
* Added a handler for linking the brushing between components
* Added crosshair geometry handler to geometry lib
* Fixed issue #15