Added second cut at new bitstream writers
- added encodeTreeBitstream() which is new version of bitstream encoder that handles
  only encoding nodes that are in view. Also handles detecting packet overflow with
  new technique
- added encodeTreeBitstreamRecursion() which is the private work horse function
- moved temporary code to searchAndEncodeMultiTreeBitstream() which is still not
  ready for prime time
new testing/debug code for encodeTreeBitstream()