Switch to side-by-side view

--- a/metric-providers/org.ossmeter.metricprovider.rascal/build.properties
+++ b/metric-providers/org.ossmeter.metricprovider.rascal/build.properties
@@ -2,5 +2,4 @@
 output.. = bin/
 bin.includes = META-INF/,\
                .,\
-               plugin.xml,\
-               r2d2.jar
+               plugin.xml