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ADD: Added methods: addMaskReplacement, removeMaskReplacement and cleanMaskReplacements in Doctrine_Pager_Layout. They are responsable to make masks behavior as another masks or values on predefined situations.

Changed the link() method's use of getLocal() and getForeign() to getLocalFieldName() and getForeignFieldName().

Added link() functionality to create links between related records. It basically works in the opposite way as unlink().

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The unset functionality is not working for foreignKey relations

Small documentation issues, insert query which hadn't had a value, reference to an example above should be below
Ticket: 656