Merge branch 'master' into lookups

Note: this resolves a conflict in the migrations. If you worked with the
lookup branch before, you will probably need to throw away your
database.

* master:
tra

Merge branch 'master' into lookups

Note: this resolves a conflict in the migrations. If you worked with the
lookup branch before, you will probably need to throw away your
database.

* master:
translation update
Version upped
Partly reverting 12fe9b2c - export user again
Return false if schema doesn't exist
Leave error handling of helper methods to the caller
Do not export the user either
Add docblocks, better names and exception handling
Set the user explicitly during import
Fix tests
Reinitialize db if $conf['meta'] changed
Save user on schema change and more imexport tools
Reevaluate page assignments when replacing them
Delete assignments as well
Add helper for im&export by other plugins

show more ...

Correctly escape SQL

Write last value to multi-table on col change

This is intended to replace pull-request #113

Do not export the user either

Set the user explicitly during import

If left unset, it will default to the currently logged-in user

Reinitialize db if $conf['meta'] changed

Save user on schema change and more imexport tools

lookup schemas can now be created

Use DokuWiki new autoloader for class files

No longer do we need to register our own autoloader. Namespace had to be
vendor prefixed.

refacored tests to use StructTest as base class

this makes schema setup and data loading much easier and gets rid of a
lot of duplicate code

handle field enable/disable

fix problem when cols or new are are not supplied in SchemaBuilder

make labels unique with case insensitivity

ensure lables are unique in the schema

use one multivalue table per schema

have a latest column on the data table

This makes it easier to query the most recent data without having to
know the exact revision time stamp it was saved (it might be different
across different ta

have a latest column on the data table

This makes it easier to query the most recent data without having to
know the exact revision time stamp it was saved (it might be different
across different tables)

show more ...

Add rollback query if a previous method fails

Fix array keys to match actual form-input names

properly handle data column creation

since we want to skip empty column names we need to create the data
columns one by one as well.

some more PHP docs for better understanding

a very first basic version of the schema editor works