Cleanup the XML publishing classes

[muloem]

Since the XML publishing work in #2285 and #3115 creates new XML classes, the old ones used for publishing can be cleaned up from the code base once both issues are complete

[muloem]

Other items to track that need cleanup.

• Unused map to remove
  

  akvo-flow/GAE/src/com/gallatinsystems/survey/dao/QuestionDao.java

  Line 588 in cf4caa7

  TreeMap<Integer, Question> map = new TreeMap<Integer, Question>();