Add IdTrie, IdNode, AbstractIdTrie, AbstractMapTrie and
MapTailLOUDSTrie. and implement newly introduced methods such as
commonPrefixSearch*** and predictiveSearch***.
fix bug that causes ClassCastException.
add remove method.
fix bugs and add MapTailLOUDSPPTrie.
long long widing load to design and implement sequential id trie...
Implement simplified TermIdTrie in DoubleArray and TailLOUDSTrie, and
MapTries for those.
refactoring DoubleArrays.
fix bug that causes OutOfMemoryError
fix bugs of Rank1OnlySBV and do refactoring of tries.
fix compile error.
refactoring for reducing code duplication.
pseudo bvtree for speed optimization.
add test for getMaxTermId.