Add aliases to ExecJobs and PhysicalOperators

                 Key: PIG-1156
             Project: Pig
          Issue Type: Improvement
            Reporter: Dmitriy V. Ryaboy
            Assignee: Dmitriy V. Ryaboy
             Fix For: 0.7.0

Currently, the way to use muti-query from Java is as follows:

1.  pigServer.setBatchOn();
2. register your queries with pigServer
3. List<ExecJob> jobs = pigServer.executeBatch();
4. for (ExecJob job : jobs) { Iterator<Tuple> results = job.getResults(); }

This will cause all stores to get evaluated in a single batch. However, there 
is no way to identify which of the ExecJobs corresponds to which store.  We 
should add aliases by which the stored relations are known to ExecJob in order 
to allow the user to identify what the jobs correspond do.

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