added arithmetic expressions to file-vars in SayScript. Big Change.
The arithmetic exprs include addition, subtraction, mult, div, mod, conditional expr (x?t:f),
excludes bit operators, includes ! (log. not), comparison (<,>,>=,<=), logical and (&&) and or (||),
and equality (==, !=); it's just integer, and bare-bones, but should be sufficient for a vast
number of possible cases. I also introduced the {len} file var, which is the current length
of the string to pronounce, which will be of immediate in the en_US money script, and perhaps
several others also.

The test01 was modified to test the new en_US money script.

Everything seems to be working, so far.