Add global -explain, -illustrate, -describe mode to PIG

                 Key: PIG-625
             Project: Pig
          Issue Type: New Feature
            Reporter: Yiping Han

Currently PIG has the command EXPLAIN, ILLUSTRATE and DESCRIBE. But user need 
to manually add/remove these lines in the script when they want to debug or see 
details of the job. I think there should be a wait to enable these globally. 

What I suggest is, to add -explain, -illustrate, -describe options to PIG 
command line. When either of these are presented, all the DUMP and STORE 
commands in the script are converted into EXPLAIN, ILLUSTRATE, DESCRIBE 
correspondingly. This makes debugging easier.

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