[REM] db_manager: remove old dependencies to datejs and timepicker and replace by momentjs
[IMP] website_forum: better implementation of automatic nofollow attribute
on links in forum posts.

This is now done when creating / updating posts instead of updating the display
of the post. This means that old posts may contain nofollow attribute altough
the user has sufficient karma; however it is acceptable compared to the computation
we save by avoiding processing every post to display.
[IMP] ir.attachment : move the fields index_content (from document), mimetype and datas_checksum (from website) to base. In base, the mimetype is computed with the Magic python lib (if installed, else with a custom function using magic number), and the index_content is an implementation of strings unix command. In document, index_content is still computed with the indexer of document module.
[FIX] typo in odoo.py

Fixes #4203
[IMP] mail : add compose mail button on top menu to send private emails
[FIX] number of blogs by month according to blog/tags
[IMP] website.theme: close the modal when the user click outside or press escape
[IMP] restaurant: some linting for the OCD among us
[FIX] pos_restaurant: please stop forward porting the obsolete 'restaurant' module. It has been renamed pos_restaurant
[FIX] pos_restaurant: fix bad forward porting merge
[FIX] pos_restaurant: properly merging the notes feature that allows custom notes on orderlines (Think Raw/Well-Done)
[FIX] point_of_sale: by default cash is returned on the payment method with cash control. If there is no such method, return it on the the first cash payment method
[IMP] account/sale/sale_layout: standardization of Quotation/Sale Order/Invoice printed layout + add missing information

- Column alignment and order are now uniform across those reports.
- Display Due date on invoices.
- Display payment term and fiscal positions notes.
[IMP] graph view on contacts
[FIX] sell future events only, not old ones
[ADD] Add the website_alias module, which tracks clicks in mass mailing mails and allow the generation of trackable links in a website interface