Major update of ecpg preprocessor

src/interfaces/Makefile

src/interfaces/ecpg/ChangeLog

src/interfaces/ecpg/TODO

src/interfaces/ecpg/lib/Makefile.in

src/interfaces/ecpg/preproc/ecpg.c

src/interfaces/ecpg/preproc/extern.h

src/interfaces/ecpg/preproc/pgc.l

src/interfaces/ecpg/preproc/preproc.y

src/interfaces/ecpg/preproc/type.c

src/interfaces/ecpg/preproc/type.h

src/interfaces/ecpg/test/mm.sql

src/interfaces/ecpg/test/test2.pgc

src/man/ecpg.1