New config app. Apps only have to define config vars once. Config pages, forms and so on are created automaticly.

Changes after some reviews are done.

Problematic is still that the JS can not be moved to an extra file because of the template tags in the code.
Merge pull request #573 from normanjaeckel/ConfigRebase1

New config app. Apps only have to define config vars once. Config pages,...
Insert Account app.
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Fix tests
Fix real login. Start setup settingsform
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