ERP5VCS: fix error with recent versions of Git when there's no upstream configured for current branch

constraint_type should be a string instead of a list.

fixup! fix unicodeconflictresolver that was causing the same error when logging the problematic text

fillRecursivePathList could load massive amounts of objects (ex:
all signatures below portal_synchronizations) even if no object was to
be removed. Instead, just iterate given lists (objects handled by
current instance, and actions to perform) and do as much rocessng before
actually attempt to load any object.

Sadly, the data structures available to this code induce an ugly O(n*m)
code, which may be optimised to O(m + log(n)) with more complex code if
really needed (but then, data structure should be improved, with a much
broader effect).

It was unreliable because done only for the first test.
Code needing this information can simply call startZServer, which will simply
return host/port of already started ZServer.

because the list of threads for Anonymous should be provided through predicate in Web Section, not from the module itself.

this commit prevents generating needless activities at the beginning of tests.

No specific role should be defined for test-related portal_types.

ERP5ProjectUnitTestDistributor.startTestSuite doesn't know about computer_guid parameter.

Conflicts:

	bt5/erp5_test_result/bt/revision

Conflicts:
	bt5/erp5_test_result/bt/revision
	bt5/erp5_test_result/bt/template_document_id_list
	bt5/erp5_test_result/bt/template_extension_id_list
(cherry picked from commit 63c1fc096663f6c96ab61e5acebe2dcbe801dfa5)

Conflicts:

	bt5/erp5_test_result/TestTemplateItem/portal_components/test.erp5.testTaskDistribution.py
	bt5/erp5_test_result/bt/revision

This is a new preference for uses of resources that can be used when creating a response to an event. The create response dialog uses it in two places:
- Only resources with this uses are proposed
- Only notification messages that creates events with resource with this use are proposed

For example, Sale Supply Lines/Cells can be customized to return values for
the caller of Movement.getPriceCalculationOperandDict

This is implemented by first changing Composition so that a model can
define several lines with same reference, masking inherited ones.

There is actually no compatibility issue, because previously, the result would
have been undefined (composition only keeping a random line).

'display_id' expects a property name and 'display_method' a method name

As Event_send is doing nothing, we don't need it. Then, return None is enough when type based method is not found.

erp5_base: Move script Event_send to erp5_core because it can raise exceptions if sendMessage method is called, for example by alarms.

Also, proxy role as Manager was removed, because this script does nothing.

also add a missing return for Base_redirect.

so that restrictedTraverse to published objects work for Anonymous.

variable_additional_price was not multiplied by the result of getPricingVariable
as it was done in previous implementation.

In order that the caller has more information about how the price was computed,
Resource_getPriceCalculationOperandDict now returns the result of
getPriceParameterDict with following changed:
- list values involved in priced calculation are replaced by their sums
- 'price' key is added to holds the computed price

Also removing fallback code from Resource class, since it's been a long time
that erp5_pdm provides Resource_getPriceCalculationOperandDict
Resource_getPrice script is kept in case some unrelated code still uses it.

There can be two cases:
- the image is on the same domain that the agent is using, then the agent is logged in
- the image is on another domain, then the agent is not logged in but we can somehow guess from referer that he is viewing the image from ERP5