and fix some bugs.

The basic idea is to track a dependency graph to find executable
messages quickly. This makes the activity system far more efficient,
when you have many inter-dependent messages queued in the tables.

Also, this obsoletes the time shifting in the schedulers,
as executable messages can be found in a more efficient manner.
So the activity parameter "at_date" should work expectedly.

Now the API of validate methods in Activities return a
list of message objects instead of a boolean value. Such
a list contains messages that are depended upon by a given
message.

The validate method in Message accepts a new optional
parameter, check_order_validation, to indicate whether
order validation should be performed. The default behavior
has not changed.

getDependentMessageList is added to ActivityTool, Queue
and Message. This method collects dependent message for
a given message from all activities.

There are some other subtle changes. Look at the diffs for
more details.


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Move _commit_prepare calls deeper in the "try" nesting to make it more robust to errors raised during preparation.
Remove assumtions made on AttributeError in _commit_prepare.


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When we just need a random tag, we don't neet to use portal_ids.generateNewLongId, but simply random.randint 



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You'll have to update existing active process instances:

from BTrees.Length import Length
for ap in portal.portal_activities.contentValues(portal_type='Active Process'):
  ap.result_len = Length(ap.result_list.maxKey())

      


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The at_date parameter must be in both the where expression and
in pamaters given to the zsql methods.


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Remove source_project from Sale Invoice Transaction's base categories, as erp5_project is not dependant from erp5_accounting.

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Define isTempDocument to specify if an object is a temporary object or persistent object, rather than using a hack. Remove hasattr in TempDocumentConstructor. Write a test for _aq_dynamic with a temporary object. Remove an unused test. Make it safe to call _aq_dynamic with a temporary object.

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Create encaisse_des_devises vault with an usd section.


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