When added for the first time, they were not editable until the page
was saved.

When an user triple-clicked on a paragraph and then typed text, the
paragraph was removed instead of its content (so the new text was
added at the beginning of the next paragraph).

See: http://stackoverflow.com/questions/38467334/why-does-google-chrome-always-add-space-after-selected-text

This commit introduce a full redesign of all JS views.  We started
basically from scratch.  The goal was to unify all the various views
under a common framework, to make them testable, to make then usable in
different conditions (in studio, or in the frontend), and to make our
lives easier.

Some important points are:
- we introduced new coding guidelines (camelCase, 80 chars width, ...)
- we have a brand new testing framework (still QUnit based)
- kanban view moved to the web addon
- calendar view (formerly web_calender) moved to web as well
- the tree view was removed
- all new code should be documented

We hope that this code is the start of a new era for the Odoo web
client, we want to have a high quality codebase, well documented, well
tested, well designed.

Work done by the framework team: mostly aab, ged, chm, dmo, qsm

There is a hackish feature in the web_editor which forces the
contenteditable to true on links which are clicked and removes it
anywhere else in the page so that only the link is editable after
click. This allows to add text at the end of a link without adding it
outside of the link by mistake.

The feature was badly implemented because, if the link was editable
without having any parent which is editable, the contenteditable was
forced to true, then immediatly forced to false when forcing to false
every page element. This was the case for lots of t-field. By example
the product categories in eCommerce are t-field links which are in non
editable <li/> elements...

* On firefox, you had to click twice on a link to be able to start
typing text
* When selecting text which contained a <br/>, you were not able to
replacing it correctly (you had to click again before starting typing)
* When replacing a whole paragraph content which was below a title,
the text was not replaced and you had to click again and the title
transformed into a paragraph.
* ...