conveience method inspect() in Doctrine_Validator_Exception. Call it with user_func and it will apply it to all ErrorStacks

fixed default error message for ValidatorException that list the classes that have validation errors

- validators codes are now string instead of integers (constants)
- validating is now handled in record level
- added new component Doctrine_Validator_ErrorStack
- new methods Doctrine_Record::isValid() and Doctrine_Record::getErrorStack()
- errorStack now as a record instance variable

removing the closing PHP tags form all php files, it\'s not needed and can break sessions which are whitespace sensitive

Many-to-Many relation fetching, fatal proxy state bug fixed, fatal loaded identity map + multiple component fetching bug fixed

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