Update to the latest 2.0 release candidate of JOGL (Build 57).

Move JOGL Libraries from lib/native to lib/jogl, which is less misleading.
Update .classpath and build.xml with new directory name.

core/.classpath

@@ -27,8 +27,8 @@
 	<classpathentry kind="lib" path="resources"/>
 	<classpathentry kind="lib" path="lib/jspf.core-1.0.2.jar" sourcepath="/home/sampo/Projects/lib/jspf/documentation/api"/>
 	<classpathentry kind="lib" path="lib/opencsv-2.3.jar"/>
-	<classpathentry kind="lib" path="lib/native/gluegen-rt.jar"/>
-	<classpathentry kind="lib" path="lib/native/jogl.all.jar"/>
 	<classpathentry kind="lib" path="lib/exp4j-0.2.9.jar"/>
+	<classpathentry kind="lib" path="lib/jogl/gluegen-rt.jar"/>
+	<classpathentry kind="lib" path="lib/jogl/jogl.all.jar"/>
 	<classpathentry kind="output" path="bin"/>
 </classpath>

core/build.xml

@@ -95,7 +95,7 @@
 			<zipfileset dir="${lib.dir}" prefix="lib">
 				<include name="*.jar"/>
 			</zipfileset>
-			<zipfileset dir="${lib.dir}/native" prefix="lib">
+			<zipfileset dir="${lib.dir}/jogl" prefix="lib">
 				<include name="*.jar"/>
 			</zipfileset>