Fix some marginal bugs, and the version of [AV]faces.

- Bump version of [AV]faces to 2.2.
- With very bad luck, some channel numbers could overflow the range of an integer due to float rounding, and produce DEBUG_CHANNEL or PUBLIC_CHANNEL as output.
- If both CHANGED_INVENTORY and CHANGED_LINK came at the same time, [AV]prop would fail to handle both.
- There was code that did nothing in [AV]faces. While it caused no bug per se, if it was reused in future then it could be affected by the same problem as that in [AV]prop.

AVsitter2/Plugins/AVprop/[AV]menu.lsl

@@ -285,7 +285,7 @@ integer prop_menu(integer return_pages, key av)
         menu_items1 = ["[BACK]"] + menu_items1;
         menu_items2 = llDeleteSubList(menu_items2, 0, 0);
     }
-    menu_channel = ((integer)llFrand(2147483646) + 1) * -1;
+    menu_channel = ((integer)llFrand(0x7FFFFF80) + 1) * -1; // 7FFFFF80 = max float < 2^31
     llListenRemove(listen_handle);
     listen_handle = llListen(menu_channel, "", av, "");
     dialog(av, custom_text, menu_items1 + menu_items2);

AVsitter2/Plugins/AVprop/[AV]prop.lsl

@@ -519,7 +519,7 @@ default
                 init_sitters();
             }
         }
-        else if (change & CHANGED_LINK)
+        if (change & CHANGED_LINK)
         {
             if (llGetAgentSize(llGetLinkKey(llGetNumberOfPrims())) == ZERO_VECTOR)
             {