Save user on schema change and more imexport tools

Reevaluate page assignments when replacing them

removed Integer type

Instead the more flexible Decimal type (with roundto:0) can be used.

removed unecessary function calls

fixed problem with multicolumns and made the param name clearer

give types a way to influence sorting

make Schema::getTimestamp() return the creation timestamp

fixed tests

some cleanup regarding timestamp setting in AccessTable*

inline editing for lookups works now

Additionally only the edited field not the wohle row is validated now.

renamed SchemaData and SchemaLookupData

This is to reflect that they no longer inherit from Schema

refactor SchemaData into AccessTable with factory

first part of the refactoring for the SchemaData and SchemaLookupData
classes. Both now inherit from AccessTable which provides common methods
and t

refactor SchemaData into AccessTable with factory

first part of the refactoring for the SchemaData and SchemaLookupData
classes. Both now inherit from AccessTable which provides common methods
and two factory methods to automatically create the correct class
depending on the schema.

Both classes no longer inherit from Schema. Instead they contain a
Schema as a member variable. This makes it possible to initialize them
with an existing schema (which is required for the factory methods).

The flow is now like this:

1: init a schema (read info from the database)
2: look at the schema to figure out if it's a lookup or not
3: initialize the right Data object with the schema

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delete lookup rows

saving lookups works

assignments and page checks do not apply to lookups

first go at the lookup table editor

All functionality is added via JavaScript after an initial AJAX call.
This call can be used to check permissions later (without the need to
invalidate caches)

fix colspan on empty result table with wildcards

lookup schemas can now be created

added lookup info to Schema class

added mising doc block

forgot to switch call after switching parameters

support * as wildcard column selection #121

iterate over tables not headers in aggregation

added way to get a single column from SchemaData

added data attributes needed for the inline editor