Added WKT parser/generator + binding for JTS geometries

I also added a convex hull process using the WKT parser/generator. Furthermore I removed the five year old javadoc.xml file, which is presumably not used for anything anymore. With the WKT parser/generator people can now use the build-in OpenLayers WPS client (e.g. http://openlayers.org/dev/examples/wps.html) with our WPS!