made sure every caller of getIdentifier can handle an array. getIdentifier now always returns an array.

reverting the reorganization done in 3455-3456 in order to make merging my experimental branch to trunk easier.

Preparation for new organization of code in to sub packages. Changed autoload() to work with new structure.

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

Rewrote data loading to support I18n data, nested set data, and better relationship defining for fixtures. Also fixes ticket:528