client_{,r}cycle() doens't need a client. so get rid of KBFUNC_NEEDSCLIENT.

this prevents the issue where you close or hide a window, and end up
with no client selected (you're on the root window). When that happened
alt-tab failed.  This, however, exposed to me a few more issues in the
alt-tabbing code:

-the code to detect how many lines we need looks bogus (you always get
three)

-alt-tabbing when everything is hidden always reawakes the most recent
window.

Fixes for these will be forthcoming.

ok simon@.

conf.c

@@ -345,8 +345,8 @@ struct {
 	{ "search", kbfunc_client_search, 0, 0 },
 	{ "menusearch", kbfunc_menu_search, 0, 0 },
 	{ "hide", kbfunc_client_hide, KBFLAG_NEEDCLIENT, 0 },
-	{ "cycle", kbfunc_client_cycle, KBFLAG_NEEDCLIENT, 0 },
-	{ "rcycle", kbfunc_client_rcycle, KBFLAG_NEEDCLIENT, 0 },
+	{ "cycle", kbfunc_client_cycle, 0, 0 },
+	{ "rcycle", kbfunc_client_rcycle, 0, 0 },
 	{ "label", kbfunc_client_label, KBFLAG_NEEDCLIENT, 0 },
 	{ "delete", kbfunc_client_delete, KBFLAG_NEEDCLIENT, 0 },
 	{ "ptrmoveup", kbfunc_ptrmove, 0, (void *)CWM_UP },