anchor.diff:  <3> Tailer "b" last reads message 0
   <4> Tailer "b" next reads message 1
   
  -This is from the `RestartableTailerTest` where there is two tailers, with a unique name each. These tailers store their index within the Queue itself and this index is maintained as the tailer uses `toStart()`, `toEnd()`, `moveToIndex()` or reads a message.
  +This is from the `RestartableTailerTest` where there are two tailers, each with a unique name. These tailers store their index within the Queue itself and this index is maintained as the tailer uses `toStart()`, `toEnd()`, `moveToIndex()` or reads a message.
   
   NOTE: The `direction()` is not preserved across restarts, only the next index to be read.
   
  
positive.code: 
  == The Changes from Chronicle Queue version 4 to version 5
  
  In Chronicle Queue 5 tailers are now read-only, in Chronicle Queue 4 we have the concept of lazy indexing, where the appenders would not write indexes but instead the indexing was done by the tailer, or to be more precise,  when lazy indexing was turned on the indexing was done by the first tailer that read the data. Since in chronicle queue 4 tailers could do the indexing we could not rely on them to be read only. We decided to drop lazy indexing in chronicle queue 5. Making tailers read-only not only simplifies Chronicle Queue but also allows us to add optimisations else where in the code.
  
  The locking model of Chronicle Queue was changed, in Chronicle Queue 4 a write lock ( to prevent concurrent writes to the queue ) exists in the .cq4 file, In Chronicle Queue 5 this was moved to a single file called a table store (queuelock.cq4t). This simplifies the locking code internally as only the table store file has to be inspected.
  
  
negative.code: riskMonitor.trade(new TradeDetails(now, "GBPUSD", 1.3095, 10e6, Side.Buy, "peter"));
  ----
  
  You can write a "self-describing message". Such messages can support schema changes. They are also easier to understand when debugging or diagnosing problems.
  
  [source, Java]
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