Here are 2 examples of fixed cases:

- File object with data=None was exported with a second file containing the
  string 'None'

- Zope Pages Templates (and derived OOoTemplate) relied __setstate__ to fix
  the wrongly imported object.

This avoids computing a file extension that may not be used (if there's no data
to export), and fixes unreliable code duplication in _guessFilename().

Plus more implicit acquisition fixed.

We'll add another test checking that nothing is exported as a separate file.

Such images don't seem to exist.
On the other side, it may be useful to test raw data.

Note that the code to get data duplicates what's done later in export().
One should problably guess extension at the last moment.

Contrary to what the code looked like, it was always using /tmp.
Which could also cause conflict with other test suites running at the same time.

This was breaking the next test.

We should have done before committing 76ecef89
but doing it now with a dummy merge also works.

Unfortunately, this is not really useful for blame, because all lines are
rewritten, at least to remove the trailing '\n'.

Files that have already been modified in 'master' branch are excluded.

Desactivate DMS to speed up restrictedTraverse document retrieval and so, speed up jIO sync

/proposed-by @jerome

Use MIME encoded words also for names.
https://en.wikipedia.org/wiki/Email#Message_header

It would be surely better to have matrixbox having possibility to
define which widget we use to display matrix variation labels.

catalog/stock: avoid duplicate calls to getInventoriatedQuantity and use better naming for variables

The business template erp5_calendar had a customized version of z_catalog_stock_list
to have possibility to index a movement like it was several movements through method
asMovementList. This is particularly needed for group calendar assignments which needs
to insert as many movements as there is periods in a given time range.

So instead of keeping it as a duplicated z_catalog_stock_list, include in the generic
z_catalog_stock_list the generic concept of one movement indexed as several movements.

This should change nothing for existing usage of stock table, since asMovementList returns (self,)
for about all movements

also set _p_changed=True in deletePropertyTranslation().

Even if this is incorrect to allow grouping lines where mirror account does not match, we want to make it possible for sites where mirror account is not used consistently to group without having to migrate the data. So we make this possible by leaving them a chance to customize AccountingTransactionLine_getGroupingExtraParameterList to ignore mirror account.

Gadget fields from erp5_core are also cleaned up.