Enable signalling of slice header in picture header

source/App/DecoderApp/DecApp.cpp

source/Lib/CommonLib/TypeDef.h

source/Lib/DecoderLib/DecLib.cpp

source/Lib/DecoderLib/NALread.cpp

source/Lib/DecoderLib/NALread.h

source/Lib/DecoderLib/VLCReader.cpp

source/Lib/DecoderLib/VLCReader.h

source/Lib/EncoderLib/EncGOP.cpp

source/Lib/EncoderLib/VLCWriter.cpp

source/Lib/EncoderLib/VLCWriter.h