added buddy to access support to the Weather endpoint
added error codes documentation
harmonized buddy-to-access init logic
more error status codes documentation
factored-out the getBuddyToAccess method to make it package-wide accessible through a new ApiHelper class
added buddy-to-access support to the manage connectors dialog (view only)
hide manage connectors controls that must not be accessible to users who are accessing a buddy's data
added buddy-to-access support to sync endpoints
added error codes documentation
added buddy-to-access header to api/sync calls in the frontend