Allows to use a two level array data on 'data' parameter for Form->postLink()

[tranfuga25s]

This allow to make use of

echo $this->Form->postLink( " Export to PDF", array( 'action' => 'imprimir.pdf' ),array( 'data' => $this->Paginator->params() ) );
and recive an array such as:
array(
    'page' => '1',
    'current' => '127',
    'count' => '127',
    'prevPage' => '',
    'nextPage' => '',
    'pageCount' => '1',
    'order' => array(
        'Gasto' => array(
            'fecha' => 'desc'
        )
    ),
    'limit' => '10000',
    'paramType' => 'named'
)

on the action.
Before the change, the order field throw a warning about converting array to string.

[lorenzo]

Would it be better if you used the query string instead? It has better support for nested parameters

[markstory]

The formatting and indentation for this set of changes is all wrong.

[markstory]

This code will continue to have problems with more deeply nested arrays. It might be better to use Hash::flatten on the data before generating inputs.

[markstory]

Thanks for submitting a patch, I decided to implement the change differently using Hash::flatten().