Frozen streams - failure cases

[charlessolar]

In several places such as conflict resolution and delayed channels streams can be frozen - meaning no one else is allowed to write to them until the instance who froze the stream releases the lock.

Currently there is no good way to detect if a stream is deadlocked (an instance freezes a stream then promptly crashes)

And maybe some others - need to think of how to handle faulted freezes.

[charlessolar]

stream freezing feature removed - this is no longer an issue