[ADD] tests for forms
[ADD] tests for calendar views
[ADD] Upgraders
      - add ICS News publication to allowed source for filters
[REFACTOR] remove all zope style DateTime
[FIX] fix the interfaces so they reflect the changes in the API
[FIX] translations
[REFACTOR] excluded items storage and filtering : use intids
[REFACTOR] remove remaining old forms (e.g excluded items,...)
[REFACTOR] get items story make queries returns items not brains
[ADD] news publication may define a default viewer
[REFACTOR] merge filter features in viewers
