Revert "bigfile/zodb: Make ZBlk1 format the default"
This reverts commit 9ae42085. When working with big arrays and accessing / changing it not in tiny bits ZBlk1 is much slower compared to ZBlk0. See details here https://www.nexedi.com/blog/NXD-Document.Blog.Wendelin.Core.Release.0.5.Performance.Tests and in 13c0c17c (bigfile/zodb: Format #1 which is optimized for small changes) Until we can rely on database handling both cases automatically, projects which care about changing arrays in small parts can manually set WENDELIN_CORE_ZBLK_FMT=ZBlk1 or under ERP5/SlapOS use this setting: slapos@2558aadd And let's have it performant in "big data" case by default. /cc @yusei, @klaus, @Tyagov /reviewed-on !5
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