�� Automatic code style fixes

PHP code sniffer autofixes

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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Introduce new factory methods for data access and deprecate old ones

Automatic coding style fixes

Save empty page ids as strings, not NULL

pid is part of primary key and so must not be NULL. Otherwise the unique constraint does not work, SQLite effectively treats every NULL as unique.

fix: proper error handling

"struct_lookup" action for bureaucracy

Action allows create struct lookup entries using bureaucracy form. Syntax:
<form>
action struct_lookup
...
</form>

<form> can contain any number of st

"struct_lookup" action for bureaucracy

Action allows create struct lookup entries using bureaucracy form. Syntax:
<form>
action struct_lookup
...
</form>

<form> can contain any number of struct_field or struct_schema. Data will be saved to respective lookup schemas.

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