Merged ecpg_big_bison back into HEAD

src/interfaces/ecpg/ChangeLog

src/interfaces/ecpg/lib/execute.c

src/interfaces/ecpg/preproc/Makefile

src/interfaces/ecpg/preproc/ecpg_keywords.c

src/interfaces/ecpg/preproc/keywords.c

src/interfaces/ecpg/preproc/pgc.l

src/interfaces/ecpg/preproc/preproc.y