Function saveLayoutSelection

Saves the layout page assignment via filter on the backend

Package: plugins
Author: Malte Müller (acrylian), Stephen Billard (sbillard)
Located at zp-extensions/multiple_layouts.php

Parameters summary
`string`	`$message`	Message (not used)
`object`	`$obj`	Object of the item to assign the layout
`string`	`$oldtitlelink,…`	Name of the item before an update (only on updates)

Return value summary
`string`	string