PhraseOrientationFeature: remove debug output
GHKM glue grammar: print word alignment links for 
 and 
,
SSTART and SEND in internal tree structure
GHKM glue grammar: Orientation phrase property
PhraseOrientationFeature: TODOs

(1) For efficiancy reasons, the initialization of the phrase orientation scoring object should be done as a precomputation step
(2) Handle degenerate cases with boundary non-terminals