[ADD] pad: new etherpad plugin to remove autofocus

In the form views where the pads are used, Etherpad-lite automatically
focus on the pad content, even if the user has already started to type
into another field.

This behavior is quite annoying for "quick changes", so we provide a
(very tiny) plugin for Etherpad-lite that will prevent this autofocus.

Detailed installation instructions are also included.
[IMP] account, account_analytic_analysis: fix labelling incoherences

- account: this change aims to keep the same labels on form and list views
- account_analytic_anlysis: correct search field
[IMP] website: correct page hierarchy for comparison snippet
[FIX] web_kanban: fixed issues when having no column to display in kanban
view.
[IMP] ir_ui_view: pep8 + log catched exception when view_id cannot be found.
[IMP] ir_http: don't handle exception in dev mode but use the werkzeug debugger except if cause has been already identified (website Qweb)
[IMP] remove instant click
[IMP] sale_stock: better inherit

Better inherit of tree view of sale order line with position="attributes"
instead of postion="replace"
Fixes #3664, #3726
[FIX] im_livechat : do not crash if not Referer url in the header of the request.
[IMP]Export Wizard: new design using bootstrap, convert dialog to widget, disable removing fields from export column and added sorting method

[IMP]modeify sorting using toggle function, removed unneccesary statments

[IMP]modify import compatible click event

[IMP]remove glyphicons and placed buttons,remain save as field always,made button disabled on not applicable and rename head

[FIX]save export list bug

[IMP]code improvement

[FIX]issue for toggle event

[FIX]Fixed the issue of domain, get_active_domain will not return promise object always hence put $.when

[REM]removing unneccesary console

[IMP]remove import compatible functionaliy

[REM]Remove Toggle function

[IMP]removing sorting functionality

[fix]get_selected_ids not defined
[IMP]replace select box with radio button for export formats