Make fieldsToRead work in loader

                 Key: PIG-653
             Project: Pig
          Issue Type: New Feature
            Reporter: Alan Gates
            Assignee: Alan Gates

Currently pig does not call the fieldsToRead function in LoadFunc, thus it does 
not provide information to load functions on what fields are needed.  We need 
to implement a visitor that determines (where possible) which fields in a file 
will be used and relays that information to the load function.

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