Fixes 204. Not sure if it's the best solution but it makes sense to call the web.views.workers the same way it's done in the sidebar

Issue #239 Removed get_details method and changed extend_context method to use Worker.get_by_user. Enhancement: now the superuser also shows a name in the upper right corner or its username if no full_name is available.

Fixes issue #237 and #232 (duplicate). Added file web/views/daily_planning.py with class TemplateDailyPlannerView

This reverts merge request !157

visit is marked as exceeded when time of the visit is exceeded and there are no scheduled appointments, when there are scheduled appointments it's marked as in progress

methods modifying structure are replaced with methods that compute arrays that could later on be merged separately