implement BTT.seekDir()
implement BTT/readBytesRef()
fix header check error
implement SegmentTermsEnum.seekExact()
implement SegmentTermsEnumFrame.loadBlock()
implement Lucene41PostingsReader.decodeTerm()
fix 'unable to copyFrom' caused by *BlockTermState wrapper
implement SegmentCoreReaders ctor
implement DefaultBulkScorer.scoreAll()
keep CFD insertion order
maintain compound entry order
fix compound file structure
fix FastestFormatAndBits()
fix compound file structure
fix segment info file content
fix gl.go test case
implement Lucene42DocValuesproducer ctor
fix ReadVInt() issue: -1
implement SegmentTermsEnum.seekExact()
implement SegmentTermsEnum.seekExact()