Here is a zope configuration example:

    <zodb>
      <loggerstorage>
        <filestorage>
          path data.fs
        </filestorage>
      </loggerstorage>
    </zodb>

- do dependency between steps only based on tags. This avoid having hardcoded
list of method ids that are not friendly with further extension
- add a mode to force doing the upgrade. Doing fully upgrade based on previous
sense() is not acceptable. For example we might be in a case of broken catalog
that does not support any new insertion until upgrade is finished

Otherwise, start_date (at least) would be a local property.

Helps automating independent test node tracking.

These 3 properties are present on existing documents, but are
local - which is bad. Declare them minimaly in a new Property Sheet.

accounting: prevent user from creating balance transaction while previous one is still beeing reindexed

Until now, it was only possible to define the ID on properties, then the
reference was guessed from the ID. We even had constraint to make sure
when we define a standard "foo" property that the ID was "foo_property".
Then the reference "foo" was guessed for the ID.

This is not user friendly, it is more logical to make the ID non editable
and guess it from the reference. Therefore now the developer could define
the reference, like "foo", and the corresponding ID will be automatically
set.

- run computation before trying to get results
- always defined a section, it is mandatory in UI so it should be in tests