[IMP] hr_timesheet: ease time tracking use of timesheets

Purpose of timesheet module is to track user time. This commit applies
various improvements and tweaking to better reflect this purpose.

This commit provides some UI improvements

 * improve views : user_id field is not displayed on 'My Timesheet'
   action, since it will always be the same user;
 * simplify menus : 'My timesheet' only for current user's timesheets
   and 'All timesheet' for everyone's. The latter one allows creating
   timesheets for someone else, if you have the required access rights;
 * add calendar views for timesheets
 * some filters are added to ease time-based filtering of timesheets

This commit also reorganizes user groups. Groups are now

 * new 'timesheet user' group (different from base.group_employee). Users
   can record their own timesheet. New access rights were added to perform
   the same operations as before.
 * 'timesheet manager' (hr_timesheet.group_manager). Users can record
   timesheets for other users, access to settings and reporting tools.

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