(localstatedir): New variable.

(CONCORD_DB_PREFIX): New variable.
(CONCORD_DB_FORMAT_VERSION): New variable.
(CONCORD_DB_DIR): New variable.
(CONCORD_SI_DB_DIR): New variable.
(CONCORD_CFLAGS): New variable.
(HEADERS): Add cos.h.
(OBJS): Add cos.lo, symbol.lo and read.lo.
(cos.lo): New target.
(symbol.lo): New target.
(read.lo): New target.
(concord.lo): Depend on cos-i.h and cos.h.