2002-12-09 added list_empty() and hash_empty() functions 2002-09-12 fixed list_iterate function to return -1 if it gets an invalid argument include and from source files, not from header file, since header file is sometimes installed as part of a user-visible API (those APIs should eventually be redesigned without the listhash code being publicly visible, but for now we need to accomodate this) 2002-07-07 modified list iterate function to return int (returns -1 if plugin function returns -1)