http_ischedule.c: rearrange order of VPOLL methods in capabilities
http_caldav.c: CALDAV:schedule-response must use DAV:href for recipients
caldav_scheduling_flowchart.html: started adding VPOLL
Revert "vzic-output.c: Why do we need X-LIC-LOCATION?"

This reverts commit 1fb39855ea57b73c90d6c0bbf01f71be7642f9b3.
http_dav.c: special sync-token for partial initial sync