In order to be able to refresh single data lists (e.g. the groupmemberships after
a membership got added), this commit disentangles data from view and enables the
outside userTool to refresh single lists.

- authentication will not check every time but simple catch an authenticated request
- api communication is separated from view definitions

add option to specify table titles and do this in accordance to the deifnitions of a given tool for a given resource
Therefore, we produce individual table-wrappers per resource / tool