Top Board support

[UEWBot]

Right now, the only support we have for a top board is that a Game can be flagged as being the top board for the Tournament. Now that we support board seeding, we need to do more.

We need to add an attribute to the Tournament to indicate whether it has a top board. If it does, when we go to seed the final Round, we can identify the seven RoundPlayers with the highest score so far, and assign them to a special "top board" Game, bypassing any other seeding. For now, we can just create GamePlayer instances without GreatPowers and leave the specification of the powers to the TD (but see also bug #7).

Need to give thought to what we want to do regarding sending out board assignment emails when there's a top board (as it stands, we send the email with powers specified, but we may want to send it without powers specified for the top board).

[UEWBot]

Note that send_board_call() will do the right thing if powers are not assigned when it is called.

[UEWBot]

From Bill H:
I would like to propose that we add a "top board" feature to DiplomacyTV. The option tree could be "stand-alone" or "concurrent."

If "stand-alone," then the settings would be "winner takes all" (yes/no) and then "score results" (yes/no) and then, if yes to rescore, "multiplication bonus" (i.e. 150%)

If "concurrent," then the settings would be "winner takes all" (yes/no) and then "lock top 7" (yes/no) - if yes to lock, then do "multiplication bonus," if no, then do "prelim score bonus" (i.e. 150%)

I think that covers all versions of top boards that I've seen. ( @chris Brand ) ... we should also include a "hide top board" function to facilitate DBN broadcast embargoes.(edited)