[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]event:improvement kanban view with sparkline_bar,guage graph widget & with event detail link like sponsors,tracks,agenda
[REM/IMP] event: Remove gauge,sparklinebar,sponsor & other links. Improvement event_kanban