__ac_persistent set to 0

<input login `request.get("__ac")` > removed

When the login form is rendered, the login field is not already filled.
We assume that the "__ac" cookie is deleted, so no need to generate the
login name server side. It also avoids to use old "__ac" cookies.
Browsers are already able to autocomplete them just by clicking on the field.

erp5_accounting_l10n_de_skr04: Update most important categories to 2012 version of SKR04 and correct wrong title "Deutch" to "Germany".

This alarm will check if a cache is assigned to some files in portal_skins.
If a file has no cache manager, it triggers a Problem.
When solving the alarm, `http_cache` will be assigned to uncached files.

Conflicts:
	bt5/erp5_administration/bt/revision

* Method is activated with max_retry 0 and no retry on conflict error
* Document is not modified in case of multiple recipients

fixup! stop copying (deprecated) Payment Condition documents from Trade Condition to Order, and from Order to Packing List.

stop copying (deprecated) Payment Condition documents from Trade Condition to Order, and from Order to Packing List.

that tries to get the property from the original and its effecive models.

In Base._getAcquiredCategoryMembershipItemList, replace broken code by an exception.

Step to reproduce:
- change preferences once
- go back to previous page with browser button
- submit again
- exception in KnowledgeBox_baseEdit because 'form_id' is sent twice
  and is transformed by Zope into a list

also simplify some error messages

export to SXC is no longer supported in LibreOffice 4.2.4.

Any blog "front" page should shows only a short blog description not entire blog post as this makes it impossible to read / follow.

Added source_trade, source and specialise to more columns and set as searchable columns

Eg, instead of 1, 6 and 12, it was being sorted as 1, 12 and 6 users.

This is required for report including Japanese characters as Bitstream
font (the default) does not handle such characters.