[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