[uicfg] uicfg.py moves from web/ to web/views/ (prepares #2406609)
We are about to make uicfg selectable. Registrable / selectable views
and helpers live in web/views. Hence the move.
Backward compat is put in place. However CubicWeb imports of uicfg are
updated to the new location.
Schema of the data------------------First take a look at the data schema_ then try to remember that you are browsingthrough a heap of data by applying stylesheets to the results of queries. Thissite is not a content management system with items placed in folders. It is aninterface to a database which applies a view to retreived data..._schema: schema