Add Lookup Support to Dropdown

Instead of specifying values directly, one can now specify a lookup
schema where the data is read from. The specified field name may contain
a $LANG place holder to be

Add Lookup Support to Dropdown

Instead of specifying values directly, one can now specify a lookup
schema where the data is read from. The specified field name may contain
a $LANG place holder to be replaced with the current language string.

There is currently no enforcement that the specified schema is indeed a
lookup schema. It should work with a non-lookup as well.

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column aliases need to differ from real column names

Otherwise the grouping is ambigious. In Search() this was the case
already.

use display value as default renderer

introduces getDisplayValue

A way to represent a complex type as a single non-complex type. Usually
this is the same as the rawValue.

Leave error handling of helper methods to the caller

Do not export the user either

make new parameter optional

fix importing into a new lookup schema

Revert "Fix broken page fields with title-option"

This is no longer needed, since getDataArray now always returns raw
values

This reverts commit 32488b14e3de6593c3d13408e3783b0fd3c03d5c.

Add docblocks, better names and exception handling

Set the user explicitly during import

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

Fix broken page fields with title-option

helper_plugin_struct::saveData() expects raw data

See #155

Fix tests

Reinitialize db if $conf['meta'] changed

handle empty rows in Search via new mechanism

adjust for removed option in AccessTable

begin stremalining raw handling #148

This starts implementing the wanted features in the Value and
AccessTable class. Calling classes and tests aren't adjusted, yet

Revert "check rawValue when checking for empty rows #148"

This reverts commit 80d194bedbc09470dbd237eec476a409de84ded0.

That change did not properly take multi values into account

check rawValue when checking for empty rows #148

added missing phpunit headers

allow multiple sorts on one line

removed unsupported config options from configparser

those were remains from other output modes in the data plugin but are
not yet supported in struct

make sure lookups aren't assigned to pages

This prevents pattern assignment and will ignore any lookups when
reading the assignments for a given page.

Should probably have some tests

cleaned up lookup syntax

This syntax is used to load the full editor for a lookup table. It
inherits most functionality from the table syntax but uses a different
output class and will always select

cleaned up lookup syntax

This syntax is used to load the full editor for a lookup table. It
inherits most functionality from the table syntax but uses a different
output class and will always select all columns.

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special columns are not available for lookups