Reduce fragmentation by aggregating chunks when writing.
Aggregation is controlled by two new properties, chunk_size and
max_chunk_size.
Implement defragmentation.

Code tolerates this with no change.
Allows jumping to an existing relation without having to hard-code
(potentially a lot of) portal types.

Also, do not use getBaseCategoryDict to avoid mutating cached value and use
a set rather than a None-value dict.
Also, access portal_categories from portal explicitly rather than relying
on acquisition.

"to split" is an irregular verb.
Also, drop badly-worded comment.

Accelerate debugging by providing relevant values right away.

getPhysicalPath is too slow to be called this often.
Flush cache on object clone, which is only useful as an after-renaming
event here.

Also, avoid a few single-use variables.
Also, use modern exception raising syntax.

This reverts commit 9668c1a1.

The problem of timezone is more complex.
Since this commit have a side effect of saving and displaying a different date
when Zope runs on a different timezone that what is configured on the field, it
is safer to revert this commit immediately.

we should not call getInventoryList if there is no account_type_to_group_by_mirror_section_previous_period

ERP5Site.py: remove workflow tool migration in site setup, because now it will install erp5 workflow tool instead of DCWorkflow tool.

Workflow.py: remove non necessary code in notifyCreated; fix _executeTransition when non transition pass to it as a parameter.

InteractionWorkflow.py: remove duplicated code, function correction according to erp5 workflow structure.

g to erp5 workflow structure.

This reverts commit ea00f588.