Rer.ufficiostampa

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- Normalize title and description on save.
[cekk]
- Add effective date in Comunicato view.
[cekk]

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- Arguments field is now required.
[cekk]

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- Cleanup subject string before send, to remove strange characters.
[cekk]

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- Cleanup channels (remove duplicated ones).
[cekk]
- Refactor how to perform queries (to handle also unicode problems).
[cekk]
- Accessibilty fixes: modal focus trap + select keyboard events
[nzambello]

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- Disallow add new items in *arguments* field.
[cekk]
- Export in csv also title and number.
[cekk]
- Correctly wrap search terms with "*'*" in it.
[cekk]
- Customize social viewlets to fix title and description meta tags (and also add a light dependency with rer.agidtheme.base).
[cekk]
- Add dependency to ftfy to better encode csv exports.
[cekk]

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- Fix import for python2 and sort indexes.
[cekk]