Version Three
Added a getToken function that returns the next token. Use this instead of using a loop to read lines in the parse procedure. The reason for this is that it means that the source of tokens can be hidden from the parse function (parse is less and less the correct name but never mind). This means that we can supply tokens from a stream of files or anything else we like. The getToken function will call in turn a getLine function which in its turn calls getFile. each has a single argument to hold the returned token, line or file and returns true as the function value if the call succeeds or false if there are no more tokens, lines or files.
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