Adding fullscreen, holdbar and unfloatvisible patches

patch/unfloatvisible.c

@@ -0,0 +1,14 @@
+void
+unfloatvisible(const Arg *arg)
+{
+    Client *c;
+
+    for (c = selmon->clients; c; c = c->next)
+        if (ISVISIBLE(c) && c->isfloating)
+            c->isfloating = c->isfixed;
+
+    if (arg && arg->v)
+        setlayout(arg);
+    else
+        arrange(selmon);
+}