Let repeated right-clicking upgrade placed piece in Edit Position mode

Let repeated right-clicking upgrade placed piece in Edit Position mode

Right-clicking a square multiple timesin Edit Position mode will now make
it cycle through all pieces defined in the pieceToCharTable.
  When -monoMouse is set a click on an occupied square is interpreted as
a left-click. But an exception is now made for the piece that was just
placed: this will be treated as a right-click, so that this feature is
also accessible in monoMouse mode.