- Updated Cobertura Maven plugin to version 2.3 (threadsafe)

- Finished refactor of instruction argument address decoding.
  Much DRYer now (but could still be DRYer yet).

pom.xml

@@ -51,7 +51,6 @@
       <plugin>
 	<groupId>org.codehaus.mojo</groupId>
 	<artifactId>cobertura-maven-plugin</artifactId>
-	<version>2.2</version>
 	<configuration>
 	  <check>
 	    <haltOnFailure>false</haltOnFailure>