Changes to the attributes

- attributes in the event view now show the date when they were added / modified

- the alert e-mail now shows which attributes are new since the last commit
Some changes from master branch

- regexp default list
- GFI improvements (removed a lot of junk imports, distribution taken from the event)
Small fix to the date filter

- fixed the datefilter to be inclusive of the border values. Entering all events from the 13th of january should include events that were created on that day, not just the 14th and newer.
Some minor changes and fix to a vulnerability

- fix to the creator of a proposal being able to also accept it
- new attributes are now shown in the e-mail denoted by a * when an event is republished
- the date of an attribute's creation is shown
Merge branch 'feature/test_attribute_date' into feature/test