Reorganized utilities chapter. Moved pagination chapter to utilities. Created advanced layouts with pager and defined basic schema of extending customizing pager layout

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().