- New PlayWordMediator class, to encapsulate the behaviour of the controls
used to play a word
- The Training mode now has input fields to play words directly, without
choosing them in the search results
- Added auxiliary windows for the history and the external board
- Gave a title to auxiliary windows and remember their position (more or less) and size
- Auxiliary windows do not survive anymore after the main one
- Preferences are now stored in a sensible place