[ot][spam][crazy] crazylog: append-only random-access data

[Undiscussed Horrific Abuse, One Victim of Many]

    class Region:
        def __init__(self, *entries, left_write = None, right_write = None):
            self.entries = entries
            self.left_write = left_write
            self.right_write = right_write
    class Write(Chunk):
        def __init__(self, offset, data, flush, left_region = None,
right_region = None)
            super().__init__(offset, offset + len(data), data, age=flush.age)
            self.left_region = left_region
            self.right_region = right_region

    def __init__(self, prev_flush = None):
        self.regions = []
        self.writes = []