* NEWS, lib/getdef.c, man/login.defs.5.xml: New login.defs

variable: MAX_MEMBERS_PER_GROUP. Used for the split groups support.
* lib/commonio.c, lib/commonio.h: Add an open_hook and close_hook
  operation. They are called after the database is actually opened
  and parse, or before it is closed.
* lib/groupio.c: Add an open_hook to merge split groups, and an
  close group to split groups if MAX_MEMBERS_PER_GROUP is set.
  This fixes gpasswd and chgpasswd when split groups are used.
* lib/sgroupio.c, lib/shadowio.c, lib/pwio.c: No open or close
  hooks for these databases. (unsure about what should be the gshadow
  behavior for split groups)

lib/getdef.c

@@ -68,6 +68,7 @@ static struct itemdef def_table[] = {
 	{"LOG_UNKFAIL_ENAB", NULL},
 	{"MAIL_DIR", NULL},
 	{"MAIL_FILE", NULL},
+	{"MAX_MEMBERS_PER_GROUP", NULL},
 	{"MD5_CRYPT_ENAB", NULL},
 	{"PASS_MAX_DAYS", NULL},
 	{"PASS_MIN_DAYS", NULL},