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�� Automatic code style fixes

Manual code style adjustments

refactoring names

To avoid confusion with the Lookup type, the three different ways of
accessing a schema have now the following names:

* page data - for revisioned struct data attached to a page
*

refactoring names

To avoid confusion with the Lookup type, the three different ways of
accessing a schema have now the following names:

* page data - for revisioned struct data attached to a page
* serial data - for an unrevisioned list of struct data attached to a
page
* global data - for an unrevisioned list of struct data not attached to
any page (formaly known as lookup schema)

The editor mechanism used for serial and global data is now called
AggregationEditor

Some reference to lookup schemas is still in the bureaucracy support
part.

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Create pages when importing serial data

Fix code style violations

Prepare to use unified schema in admin CSV export/import

Remove islookup property of schemas

CSV import must still be adjusted

Automatic coding style fixes

add raw CSV export

This allows exporting the raw data of a schema in the same format as
used in the CSV import.