disable resigning while viewing an old board position (fixes #115)
disable resigning while viewing an old board position (fixes #115)

herzbube/littlego,herzbube/littlego,puremourning/littlego,herzbube/littlego,puremourning/littlego,puremourning/littlego,herzbube/littlego,puremourning/littlego,herzbube/littlego