Code refactoring: Create optimization out of store/load post processing code

                 Key: PIG-777
             Project: Pig
          Issue Type: Improvement
            Reporter: Gunther Hagleitner

The postProcessing method in the pig server checks whether a logical graph 
contains stores to and loads from the same location. If so, it will either 
connect the store and load, or optimize by throwing out the load and connecting 
the store predecessor with the successor of the load.

Ideally the introduction of the store and load connection should happen in the 
query compiler, while the optimization should then happen in an separate 
optimizer step as part of the optimizer framework.

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