Display all courses in calendar view based on data from dd - Filtering still todo

Kamil Baran:-
DONE - We badly need to see the list of planned courses. The most intuitive way is to display it as a calendar. Picture shows how it looks in google calendar after copying all the courses from cloud.dadesktop.pl

DONE - The calendar should show by default current week + 2 next weeks.

TODO Filtering:

by organisation, (all, my organisations, org x, org y, org z, etc), default: my organisations
by server (all servers, rz10pl, rz11pl, etc), default: all
by date (please choose something that is easiest to implement, filtering like in google calendar is perfect)