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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

Changed loadModels() once again. Removed loading of models based solely on model filename. Added support for different models with the same file names. All models files are required, in order to determine class names. The changes result in an overall increase in flexibility with respect to model file names.