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/AVcontrol/[AV]root-RLV-extra.lsl

@@ -175,8 +175,8 @@ state running
             product = llList2String(data, 2);
             llListenRemove(menu_handle);
             llListenRemove(GETSTATUShandle);
-            menu_handle = llListen(menu_channel = ((integer)llFrand(2147483646) + 1) * -1, "", CONTROLLER, "");
-            GETSTATUShandle = llListen(RELAY_GETSTATUS_CHANNEL = (integer)llFrand(999999999), "", "", "");
+            menu_handle = llListen(menu_channel = ((integer)llFrand(0x7FFFFF80) + 1) * -1, "", CONTROLLER, ""); // 7FFFFF80 = max float < 2^31
+            GETSTATUShandle = llListen(RELAY_GETSTATUS_CHANNEL = (integer)llFrand(999999936), "", "", ""); // 999999936 = max float < 1e9
             if (num == 90208)
             {
                 main_menu();