* Added AT90CAN128. Other Atmega128 style controllers should work

    *  too.
    * lot of fine tuning.
    * dropped the assembler device init portion.
    * New file: dict_compiler.inc. Without these words the forth system
    * is (more or less) a pure interactive system without extensibility.
    * new words [char], fill.
    * re-arranged usart code. fixed bug when usart baud rate calculation
    * leads to values greater 255.
    * renamed /int to -int and int to +int, it's more fortish ;=)