* scripts/java/OBTest.java: Bring back test program.

* scripts/openbabel-java.i, scripts/openbabel-perl.i,
        scripts/openbabel-ruby.i: Fix script bindings. Now compile
        cleanly. Perl still needs work to pass tests.

        * include/openbabel/math/spacegroup.h, include/openbabel/plugin.h:
        Minor updates for SWIG compatibility.

scripts/java/OBTest.java

@@ -0,0 +1,21 @@
+public class OBTest
+{
+  public OBTest()
+  {
+    System.loadLibrary("openbabel");
+  }
+
+  public void run()
+  {
+    OBConversion c = new OBConversion();
+  }
+
+  public static void main(String[] args)
+  {
+    System.out.println("Running OBTest...");
+
+    OBTest test = new OBTest();
+
+    test.run();
+  }
+}