width and movesWidth combined don't work as expected

[mliebelt]

When you combine the configuration parameters width and movesWidth, they don't have the expected effect:

• Layout top: movesWidth is ignored completely (which may be the right decision).
• Layout left: movesWidth works, but boardWidth is not set as width - movesWidth, so at the end, the moves may overlap some other region.

The following screenshot comes from the configuration: {pgn: pgn, layout: 'left', width: '400px', movesWidth: '200px'}

So the board size is computed wrong here. Some more combinations should be tested as well.