src/com/infomatiq/jsi/ contains the Java Spatial Index (JSI) library (http://jsi.sourceforge.net/).
The library is under LGPL license. Log4j dependency has been removed from class RTree to prevent
a dependency on it.

src/gnu/trove/ gathers only the necessary parts of GNU Trove 2.1.0 required by
com.infomatiq.jsi and org.simantics.scenegraph.g2d.nodes.spatial packages to
keep the size of the org.simantics.scenegraph plug-in and its dependencies down
to a minimum.