Hierarchical error messages plus some more tweaks

- hierarchical error messages for different error types
- renamed ofp_stats_types to ofp_stats_type
- renamed OFP_VENDOR to OFP_EXPERIMENTER in OF 1.0 input file
- use ofp_capabilities enum in of_features_reply
- use boolean type for l2_table_enable field in of_bsn_set_l2_table_(request|reply)
- return Set<OFActionType> for actions field in of_features_reply
- added DatapathId class that's returned for datapath_id field of of_features_reply
- removed unused read/write routines from OFBufferId
- added getOFVersioon method to factory classes/interfaces
- renamed OFPT_MULTIPART_(REQUEST|REPLY) to OFPT_STATS_(REQUEST|REPLY) in OF 1.3 input file
- renamed ofp_multipart_types to ofp_stats_type in OF 1.3 input file
- tweaked python backend to work with consistent use of of_stats_xyz vs. of_multipart_xyz in 1.3
diff --git a/java_gen/templates/of_factory_class.java b/java_gen/templates/of_factory_class.java
index 86b092a..7329fc2 100644
--- a/java_gen/templates/of_factory_class.java
+++ b/java_gen/templates/of_factory_class.java
@@ -42,6 +42,10 @@
     public final static ${factory.name} INSTANCE = new ${factory.name}();
     private ${factory.name}() {}
 
+    public OFVersion getOFVersion() {
+        return OFVersion.OF_${factory.version.of_version};
+    }
+
     //:: for name, clazz in factory.interface.sub_factories.items():
     public ${clazz} ${name}() {
         return ${clazz}Ver${factory.version.of_version}.INSTANCE;