Implement _NET_WM_STATE_STICKY, bound to CM-s by default; allows any

client to 'stick' to all desktops (ewmh speak) or groups - this
currently has the same affect as setting a client's group to 'nogroup',
with the exception that the client can also be in a group, so when
un-sticking, the client will go back to its original group/desktop.

conf.c

@@ -204,6 +204,7 @@ static const struct {
 	{ "CM-g",	"grouptoggle" },
 	{ "CM-f",	"fullscreen" },
 	{ "CM-m",	"maximize" },
+	{ "CM-s",	"sticky" },
 	{ "CM-equal",	"vmaximize" },
 	{ "CMS-equal",	"hmaximize" },
 	{ "CMS-f",	"freeze" },
@@ -389,6 +390,7 @@ static const struct {
 	{ "rcycleingroup", kbfunc_client_cycle, CWM_WIN,
 	    {.i = CWM_RCYCLE|CWM_INGROUP} },
 	{ "grouptoggle", kbfunc_client_grouptoggle, CWM_WIN, {0}},
+	{ "sticky", kbfunc_client_sticky, CWM_WIN, {0} },
 	{ "fullscreen", kbfunc_client_fullscreen, CWM_WIN, {0} },
 	{ "maximize", kbfunc_client_maximize, CWM_WIN, {0} },
 	{ "vmaximize", kbfunc_client_vmaximize, CWM_WIN, {0} },
@@ -678,6 +680,7 @@ static char *ewmhints[] = {
 	"_NET_WM_DESKTOP",
 	"_NET_CLOSE_WINDOW",
 	"_NET_WM_STATE",
+	"_NET_WM_STATE_STICKY",
 	"_NET_WM_STATE_MAXIMIZED_VERT",
 	"_NET_WM_STATE_MAXIMIZED_HORZ",
 	"_NET_WM_STATE_FULLSCREEN",