File Output

This module is used to direct records in the performance analysis graph
to a file for later use.  Since Pablo allows input data to undergo a
variety of transformations, it is often useful to store this transformed
data, in the form of records, to a file.  

During configuration, the user is prompted for a file name to indicate
where the output should go.  The user also selects if the records should
be output in ASCII or binary.  

When the graph is run, all records that are passed down to the file output
module will be stored in the specified file.
