[components] refactor main template header: make it much more flexible by using CtxComponent * rename userlink class (not private) with somewhat bw compat * make some cosmetic adjustements on log-in/registration components * update to component api, though this may breaks some sub-classes (for application customizing the breadcrumbs component for instance)

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Schema of the data

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First take a look at the data schema_ then try to remember that you are browsing

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through a heap of data by applying stylesheets to the results of queries. This

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site is not a content management system with items placed in folders. It is an

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interface to a database which applies a view to retreived data.

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.. _schema: schema