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/AVsequence/[AV]sequence.lsl

@@ -208,7 +208,7 @@ stop_sequence(integer stopSound)
 sequence_control()
 {
     llListenRemove(menu_handle);
-    menu_channel = ((integer)llFrand(2147483646) + 1) * -1;
+    menu_channel = ((integer)llFrand(0x7FFFFF80) + 1) * -1; // 7FFFFF80 = max float < 2^31
     string pauseplay = "▶";
     if (sequence_running)
     {