Until now, only bt5 Extension/Test/Document could be migrated from
filesystem.

From migration dialog, allow to select any Products.ERP5.Document.* (only,
for now) to be migrated. By default, automatically select Products Documents
used by the current bt5 Portal Types (by looking at the mro() of its
erp5.portal_type classes).

Also, to easily identified where it was migrated from, source_reference
is set to 'bt.getTitle():ID' for bt5 Extension/Test/Document and
'Products.ERP5.Document.XXX' for filesystem Products.

One Mixin to handle {Document,Interface,Mixin,Test,Extension} code from:
  * deprecated local (instancehome/XXX).
  * ZODB Components.
  * Products migration (in a later commit).

Kill any process having in command line the path reserved for unit
test. This would really allows to kill any remaining process if any.

Do not look if processes are child of testnode, because processes
like mariadb and others are not running as child

portal.portal_simulation.getInventoryList(section_category='', src__=True)
use query like
AND (`related_stock_section_category_uid_1_category`.`category_uid` = 281(Uid of portal_categories)

Kill any process having in command line the path reserved for unit
test. This would really allows to kill any remaining process if any.

Do not look if processes are child of testnode, because processes
like mariadb and others are not running as child

It was incorrectly assuming style of passed information.

SlapOS will publish directly SQLBENCH_PATH in environment, so
start using it also trusting that PATH is correctly set to find proper perl,
with fetching old OPENSSL_BINARY and finding perl in the old wayas fallback.

otherwise Firefox (with default configuration) may display strange colors, especially if the original uses ICC v4 profile.

Notify the user and redirect to the storage page to force user to enter credentials if needed

This fixes the issue that a transaction with many big messages failed to
commit. By dynamically find the maximum allowed size of a query, it also
speeds up insertion by minimizing the number of queries.

This moves the remaining DTML queries to Python, dropping the 'activity' skin.

Dealing with conflicts of uids is easier if the inserted uids are consecutive:
now, only 1 random value is generated, as base uid. This also preserves the
order of insertion, which is wanted for performance reasons:
- No more random write in the primary index.
- When modifying several lines of several documents, 1 document being processed
  at a time, we'd like that any grouped activity (usually indexation) follows
  the same order, so that a processing node prefer many lines from a few
  documents instead of mixing lines from too many documents at the same time.
  This is usually better for caches.

Average age of activities is dropped because it would become
too complicated to implement and it's useless information.

The original goal was to improve performance by removing the
`processing_node_processing` index and the queries that modified
these 2 useless columns.

The root call to getExecutableMessageList (i.e. the one from distribute)
is fast enough and won't hold old revisions of the database for too long.
It is also completely read-only so it won't lock anything.

This caused useless communication with the server.

As shown in the following example, on a big catalog table,
MariaDB is able to use several indices at the same time
('...' are obfuscated unique values):

  > analyze select SQL_NO_CACHE uid, relative_url from catalog where reference='...' OR relative_url='...';
  +------+-------------+---------+-------------+------------------------+------------------------+---------+------+------+--------+----------+------------+--------------------------------------------------+
  | id   | select_type | table   | type        | possible_keys          | key                    | key_len | ref  | rows | r_rows | filtered | r_filtered | Extra                                            |
  +------+-------------+---------+-------------+------------------------+------------------------+---------+------+------+--------+----------+------------+--------------------------------------------------+
  |    1 | SIMPLE      | catalog | index_merge | Reference,relative_url | Reference,relative_url | 768,767 | NULL |    2 |   2.00 |   100.00 |     100.00 | Using union(Reference,relative_url); Using where |
  +------+-------------+---------+-------------+------------------------+------------------------+---------+------+------+--------+----------+------------+--------------------------------------------------+
  1 row in set (0.00 sec)

So mixing different dependency types with OR should be fine
(no need to split into more subqueries and join with UNION).

only covers interface compliance and high level parts of sending

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