Log Message:
Update cgoban-java to 2.6.9.  Notable changes include:

C13 - Pause, Fast forward, & slider added to playback games.

C13 - When you set up a challenge as ranked that cannot be ranked (due
to board size or time or whatever), it no longer creates a
popup. Instead, sets the rank type to "Free", turns it blue, and makes
the tooltip be a description of why playing ranked is impossible.