Fix code style

Fix check of latest page metadata

Fix struct editor missing on DokuWiki master

In the big refactoring of html.php in Dokuwiki, the events like
HTML_EDITFORM_OUTPUT were removed and replaced with FORM_EDIT_OUTPUT.
See splitbrain/doku

Fix struct editor missing on DokuWiki master

In the big refactoring of html.php in Dokuwiki, the events like
HTML_EDITFORM_OUTPUT were removed and replaced with FORM_EDIT_OUTPUT.
See splitbrain/dokuwiki#3198

This PR adds support for the new event and maintains the support for the
legacy one. It is expected to work both on the currently released
version of DokuWiki and the current tip of the development branch.

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Fix migration statement affecting some fields

Multivalue lookup fields referencing page schemas got corrupted by error
in SQL statement

Only update page metadata on new revision

Implements a basic comparison of page revisions before update. We used to write to the database on every rendering just because PARSER_METADATA_RENDER is th

Only update page metadata on new revision

Implements a basic comparison of page revisions before update. We used to write to the database on every rendering just because PARSER_METADATA_RENDER is the only event that supplies all the required metadata. An additional database query is better than the redundant save.

Fixes #528

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Bureaucracy integration: use earlier event to handle lookup fields

Fixes #483

Fix code style violation

Replace both page and global lookups

fixes #483

Simplify branching code

Option to display page data at the bottom

Resolves issue #371

Fix deleting lookup entries

Fixes #506

Fix order in which lookup columns are migrated

Fix some incorrectly migrated lookup data

Fix migration of lookup fields pointing to pages

fix migration for structcombolookup plutin

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

More sensitive check for which version of schema should be loaded

Fix code style violations

Remove islookup property of schemas

CSV import must still be adjusted

Migrate database to unified schema

Load current schema in inline editor

Using page revision could cause loading of outdated schemas, but the
inline editor should only be used with current data.

Use composite lookup values when moving pages

Restructure search query

Move schema assignment clauses into an ever-present JOIN, conditional on pid. Also remove the $idColumn parameter, previously used to check if schema assignment clauses shou

Restructure search query

Move schema assignment clauses into an ever-present JOIN, conditional on pid. Also remove the $idColumn parameter, previously used to check if schema assignment clauses should be added to queries.

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Manual coding style fixes

Method and variable visibility, camel case method names. Some exclusions due to inheritance