Made page reference serialization variable-length.
Made page reference serialization variable-length.

git-svn-id: a5379eb5ca3beb2b6e029be3b1b7f6aa53f2352b@3124 e3ddb328-5bfe-0310-b762-aafcbcbd2528

sebastiangraf/treetank,sebastiangraf/treetank,sebastiangraf/treetank