Reorganize directories under lib/java as per mvn format to make things easy

Under lib/java - we have src and test -

To begin with - we need to change the src tree a little bit to make things easy for maven repository publishing.

• Code under src/** should be moved to src/main/java
  Code under test/** should be moved to src/test/java

Create appropriate directories in svn and move the source tree using svn commands.

Apply the patch attached to build.xml to make sure that the current build continues to work.