update copyright
Updated c.t.h.Hfs to log a warning and disable o.a.h.m.l.CombineFileInputFormat (if enabled) if c.t.h.HfsProps#isCombineInputSafeMode is true but the current o.a.h.mapred.InputFormat is not a o.a.h.mapred.FileInputFormat.
Updated c.t.TupleEntryCollector javadoc to clarify re-use of c.t.Tuple instances.