bigfile/zodb: Make auto format the default
If a user doesn't explicitly declare a ZBlk format, it can be assumed that this user wants to have the best ratio between consumed storage space and data access speed. Currently the best ratio between these two is provided by the new 'auto' (heuristic) format. In case of small appends this format helps reducing storage space, and in any other case it just behaves like ZBlk0 [1]. Therefore this default ensures a fast access speed [2], but also avoids a massive data growth in case of many small appends [3]. [1] An exception to this is: in its current implementation a block behaves like ZBlk1 (slow access) in case it isn't fully filled up yet. [2] As this was stated as a reason why ZBlk1 as a default format was reverted in 0b68f178. [3] This was perhaps the reason why ZBlk1 was set to be the default format in 9ae42085. The massive storage space consumption can already be a problem with few array to which regularly small data is appended to, as it can easily happen with Wendelin development instances. /reviewed-by @kirr /reviewed-on !20
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