Refresh SPI after plugin installation

Script

cls = net.sf.taverna.t2.activities.dependencyactivity.AbstractAsynchronousDependencyActivity.class;
cl = cls.getClassLoader();
r = cl.getRepository();
a = new net.sf.taverna.raven.repository.BasicArtifact("org.purl.wf4ever.provtaverna", "prov-taverna-ui", "2.0.1-SNAPSHOT");
cl2 = r.getLoader(a, null);
regCl = cl2.loadClass("net.sf.taverna.t2.workbench.views.results.saveactions.SaveAllResultsSPIRegistry");
getInstanceMeth = regCl.getMethod("getInstance", new Class[0]);

reg = getInstanceMeth.invoke(null, new Object[0]);
reg.refresh();
out1 = reg.toString();