Interactive mode doesn't list defined aliases

                 Key: PIG-704
             Project: Pig
          Issue Type: Improvement
          Components: grunt
            Reporter: Eric Gaudet
            Priority: Trivial

I'm using the interactive mode to test my scripts, and I'm struggling to keep 
track of 2 things:

1) the aliases. A typical test script has 10 aliases or more. As the test goes 
on, different versions are created, or aliases are created with typos. There's 
no command in grunt to get the list of defined aliases. Proposed solution: add 
a new command "aliases" that prints the list of aliases.

2) I prefer to give meaningful (long) names to my aliases. But as I try 
different things, I find it hard to predict what the schema will look like, so 
I use DESCRIBE a lot. It's a pain to type these long names all the time, 
especially since most of the time I only want to describe the last alias 
created. A shortcut to the describe command describing the last alias will be 
very useful. Proposed solution: use the special name "_" as a shortcut to the 
last created alias: DECRIBE _.

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