ERP5Type.Core.Folder: Split _count on large containers.
Divide conflict hot-spot to improve write performance: now, conflict risk will not be proportional to the number of zope processes, but only to the number of threads within considered process (...because there is no stable thread name, if there is one day and conflict splitting is needed, it will be easy to implement: just concatenate that name to node name in FragmentedLength._map). Automatically migrate to FragmentedCount on containers larger than 1k objects (this threshold may evolve).
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