[IMP] web_calendar: upgrade dhtmlxSchedule to v3.7 std
[FIX] web_calendar: rework attaching / detaching openerp related events to dhtmlxScheduler

   - calling scheduler.detachAllEvents() will remove all scheduler binded events,
     including those added by other dhtmlxScheduler extensions - so basically
     this will broken them all!.

     So now we include two wrapper scheduler_addEvent, scheduler_detachAllEvents
     that will store event id during init_scheduler() and detach only OpenERP's
     related events uppon destroy().
[FIX] web_calendar: calendar view not glossy enough? switched to using 'terrace' theme
[IMP] web_calendar: improve display on responsible color

  - responsible color in calendar sidebard are now display in a little
    badge - instead of coloring all the line. This improve visual style
    and also make the reponsible (or whatever color="" field) more readable.
[IMP] web_calendar: rework logic of minicalendar view switching

 - rework logic for switching between views in date picker
   * month: clicking a day switch to week mode on that date.
   * week: - clicking a day in the same week, switch to day at that date
           - clicking a day in another week, switch to week at that date
   * day: - clicking the same day as current date, switch back to week mode
          - clicking on another day, switch to day at that date
[FIX] web: fix pyeval relativedelta weeks/days overflow

 example for today == 2013-06-10, pyeval of:
    context_today() + relativedelta(days=21) ==> 2013-06-01
 should be:
    context_today() + relativedelta(days=21) ==> 2013-07-01

 ``day`` is updated after adding ``days_offset`` but not month, nor year
[FIX] web_calendar: improve minical style of 'day having events'
[FIX] web: fix editable list on wrong active id
[IMP] web_calendar: multiple styling and ergnonomics changes

  * timed event (i.e != all day) displayed on month view are shown in
    non-interted mode - text w/ color + white background

  * allow user to move event by clicking on event body. Just allowing
    title is not suffisient because small events became sort of unselectable.
[IMP] web_calendar: activer limit & quick infos plugins
[IMP] web_caledar: add demo timeline calendar view
[FIX] web_calendar: remove hack about z-index for dhtmlxSchedule glossy theme - we're not using this one anymore
[IMP] web_calendar: change default value for timeline view, extract calendar options
[FIX] web_calendar: hide quick-info when clicking outside of that box
[FIX] web_calendar: revert of r3998 to reintroduce z-index hack, but forced to 0 - so that 'calendar date' displays correctly
[IMP] web_calendar: improve look of day & week 'hours scale'
[FIX] web_calendar: do not make any transition when showing quick-info box, this slow things down
[FIX] web_calendar: fix unwanted drag'n'drop when clicking on different events rapidely + js exception when double-hidding quick-info
[FIX] web_calendar: fix error caused by Timeline view not correctly uninitialized
[FIX] web_calendar: fix scroll_hour not working properly when switching between menus (diff. actions)