[views/table] parametrize table view co-classes (closes #1947472)

[cwproperties] refactor properties form to make it partly overrideable easily (closes #1936782) also fix some pitfalls on the way: * shouldn't capitalize labels, this has to be done in translation files as desired * form_row in CWProperties form didn't return subform as its parent class

[entity] rename Entity._rest_attr_info into cw_rest_attr_info (closes #1942759)

[entity] upgrade fetch_[unrelated_]order to benefit from changes introduced in 3.14 (closes #1942758) of rql generation parts of the ORM now based on rql syntax tree. This allows more powerful and flexible sort control by giving them the syntax tree instead of manipulating string. Also: * prefix new methods by 'cw_' * fix cases that currently crash in 3.14 due to the refactoring

[schema] drop CWSourceSchemaConfig[cw_for_source,cw_schema] unique constraint (closes #1946277) as they are not necessarily unique, eg when one want a configuration for both subject and object

[cleanup]

[jsoncontroller] deprecate the now unused js_set_cookie (closes #1944810)

[repo] ensure we don't restart a task while the repo is shutting down (closes #1942736) we need a safety belt in cw itself again looping task which use 'try / except' or doesn't need to access the db (which will trigger ShuttingDown exception)

[warnings] explicitly ask to show DeprecationWarning in debug mode (closes #1942760) as python 2.7 don't show DeprecationWarning by default

[testlib] make self.view() return raw output if no validator is used This will make it possible to parse and test view's output even if no validator is associated to the view's content type.

[tabs] do not use an ajax call to set cookie value, use jquery.cookie helper instead (closes #1944522)

[tabs] fix clic on tab that does nothing (closes #1942750) (there was an area around the text that would trigger the tab switch but not load the tab content)

[idownloadable] dtw and up copyright

[test] fix test broken by 7815:2a164a9cf81c

[entity doc] fix typo (rest_var instead of rest_attr) and cleanup doc

[exceptions] stop catching any exception in various places (closes #1942716)

[tableview] fix view selection when value is None (closes #1936781) * in case of None on final view, use explicitly asked view anyway * when etype is None, that means it's a non final entity type

[book] merge pyro chapter with faq entry with connexion snippet

i18n update

[schema view] fix label/name inversion leading to wrong css class / group url depending on user's language

[i18n] tweaks

[i18n] cleanup messages moved to localperms cube

[security view] slight changes to make things clearer

backport stable

[refactoring] introduce add_etype_button function to properly create button to add a new entity also properly use cw_create_url to generate the URL to add the entity

[user prefs] use same title as the action for consistency

[sources management] properly set __linkto, closes #1922970 when clicking on 'add mapping part' on an external source view, one expect to have source properly selected in form

some minor cleanups

[web test] fix test broken by new users/groups management views

[table view] allow to set None in 'headers', meaning the label should be fetched from the result set as done by default (closes #1931533) the point of this is to avoid having to define the whole headers list when only some of them have to be defined.