IndexOutputBuffer.java:
Removed useless ComparatorBuffer interface.
Renamed compare(int, int) to compareInts(int, int).
Extracted method compareArrays().
Inlined compareLengthThenIndexID(), replaced by two successive calls to compareInts().
Extracted compare(byte[] array1, int offset1, int length1, int indexID1, byte[] array2, int offset2, int length2, int indexID2) + inlined two other compare() methods that are now referencing the newly extracted compare() method.