Increment turn_time to make up for slower network connections.

[Alberdi]

Due to the current network/update/render protocol, increasing turn_time from 0.1 (current) to 0.2 (looks good) will cut in half the FPS from 10 to 5, and that's not a lot to simulate fast effects and things like that. Futhermore, we are using those ticks to update all the entities, so they will seem slower if we increase turn_time but stick with the same values for each default_next_action.

[Alberdi]

Might not be so critical after this commit, but it requires more testing.