8ccd31fe49
Internally whether a coin is frozen is tri-state: - forced-True, set by the user - forced-False, set by the user - unset/default: is_frozen_coin() can decide whether the coin should be frozen This patch lets set_frozen_state_of_coins() undo a previous explicit setting of True/False, by calling it with a value of None. Note: there is still no way in the GUI to undo an explicit setting of True/False.