Update copyright header.
Move code to include "config.h" into sysdep.h.
(CONCORD_BDB_open): Use <char*> instead of <unsigned char*> for db_dir, genre, key_type and name. (CONCORD_BDB_get): Use <char*> instead of <unsigned char*> for key. (CONCORD_BDB_put): Likewise.
New files.