Better message for problem choosing UDF

                 Key: PIG-633
             Project: Pig
          Issue Type: Bug
    Affects Versions: types_branch
            Reporter: Olga Natkovich
            Assignee: Santhosh Srinivasan
             Fix For: types_branch

"ERROR 1045: Could not infer the matching function for 
org.apache.pig.builtin.CONCAT as multiple or none of them fit. Please use an 
explicit cast." - I think it would be nice to separate case of multiple matches 
and show the list of signitures for fuctions that were matched and the case of 
not match and then show all available functions.

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