modified the handling of end of sentence in parser

maca_common/include/word.h

maca_common/include/word_buffer.h

maca_common/src/word_buffer.c

maca_tools/src/mcf2conll.c

maca_trans_parser/src/config.c

maca_trans_parser/src/movements.c

maca_trans_parser/src/simple_decoder_parser_arc_eager.c