Added support to leftJoin and innerJoin parameters. Included some tests that failed due to an existent Doctrine bug.

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

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The unset functionality is not working for foreignKey relations

Doctrine_Query_Tokenizer::bracketExplode() were case sensitive, and 
changed tokenizer to make them case insensitive.

Introduced a new attribute ATTR_AUTOLOAD_TABLE_CLASSES that can be used to control whether Doctrine should try to autoload custom table class files when looking for them.

The default is set to false because fetching the relations deletes
previously fetched relations =P. This is, if you fetched an aggregated
value (SUM, COUNT), it wont be refreshed, it will be overwritten by the
actual related values.