Not all appearance messages on a region will be new or old style at all times.
Thus we're using a specific flag to mark the new appearance messages.

a trivial code change for  SH-3073. The change makes sure to clear the texture fetching queue ONLY once during a teleporting.

Setting the description column of the linkset floater to be a fixed width.  Having multiple dynamic width columns apparently prevents other columns from being manually resized by the user.

After exiting appearance mode, next server-generated appearance message should
over-ride the locally-generated textures.