[IMP] Partner Form View Reorganization
[FIX] point_of_sale: uncrash widget.js

Error during forward port
[IMP] project: onboardin / usability improvements

- project kanban view: dashboard-like view, add sparklines for open tasks
and closed issues
- project: cleaned demo data, less stages
- project: description is now an html field
[FIX] res_users: set login_date as datetime instead of date

To allow display the login date according to the timezone of the user
[IMP] project: project alias generation is True by default.
[IMP] project: better diplay of task/issue title
[ADD] Add an html compressor option in website settings
[IMP] CRM Onboarding improvement
[IMP] sale_stock: warehouse_id field on sale order is now readonly, except in draft and sent states.
[IMP] accounting: modify writeoff_amount display in payment wizard
[FIX] website_mail & calendar: demo data break the layout of mail design
[FIX] website_mail: can't be edit the mail template, javascript must be added into the asset
[FIX] website: remove multi consecutive dropzone
[FIX] snippets: use the new API to define dropzone
Merge pull request #2547 from odoo-dev/master-fix-mass-mailling-snippet-chm

[FIX] website_mail: can't edit mail templates
[IMP] Event: Split Tickets
Attendees are created on SO confirm.
Attendees are directly created for FREE registrations and
Attendees are created and SO are linked to the paid tickets.
Improved code to make (5 attendees lines, 2 SO lines) when 3 vip tickets and 2 standard tickets are bought.

This commit fullfills the following Goals:

Goal 1 : When only website_event is installed, free registration should be possible from website.
Goal 2 : When only event and website_event are installed, badge report should be print for free registrations.
Goal 3 : When website_event_sale is installed, at that time on confirming the sale order, the subscription line are splited per attendees.
Goal 4 : Added code for attendees registrations through SO. Now from SO also the attendee's details for the event can be filled same as from website