Refactorings for schema files and Doctrine_Record builder. More to come but got held up on some things that zYne- must fix first.

CHG: Added documentation for Doctrine_Pager and Doctrine_Pager_Range* classes
TODO: Finish pagination documentation

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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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