scanner: use batch mode; nuke isatty calls.

The flex-generated scanner wastefully calls isatty(0) whenever
it is initialized, even though we don't read from a stdio
stream. Even (read "abc") will call isatty(0), which is
unacceptable.

Moreover, this happens even if Flex is told to operate in
batch mode rather than interactive.

With the following change, the isatty calls are gone.
Let's switch Flex to batch mode, too.

* parser.l: Remove <unistd.h> inclusion. Define isatty as a
macro that returns zero. Add the batch option to the scanner.

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