[hooks/security] provide attribute "add" permission As of today, the update permission on attributes is checked at entity *creation* time. This forbids using update permissions the proper way. We set it to be checked at entity update time only. We introduce a specific 'add' permission rule for attributes. For backward compatibility, its default value will be the same as the current 'update' permission. Notes: * needs a new yams version (ticket #149216) * introduces two new 'add_permissions' rdefs (attribute - group|rqlexpr) * if the update permission was () and the bw compat kicks in, the rule is not enforced, to avoid un-creatable entity types -- this restriction will be lifted when the bw compat is gone * small internal refactoring on check_entity_attributes * one small pre 3.6.1 bw compat snippet must be removed from schemaserial Closes #2965518.

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/**

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 *  functions specific to cubicweb on google appengine

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 *

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 *  :organization: Logilab

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 *  :copyright: 2008-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

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 *  :contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr

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 */

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/**

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 * .. function:: rql_for_eid(eid)

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 *

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 * overrides rql_for_eid function from htmlhelpers.hs

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 */

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function rql_for_eid(eid) {

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        return 'Any X WHERE X eid "' + eid + '"';

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}