* expr.h: Fix comments in operatorT typedef.

    * expr.h: Fix comments in operatorT typedef.
        * config/tc-z8k.c: Add 2003 to copyright message.
        Fold s_segm() and s_unseg() into one function s_segm(parm) which
        decides by the parameter.
        (md_begin): Don't set linkrelax.  Only set Z8002 default if no
        command line argument was given to select the intended
        architecure.
        (get_interrupt_operand): Warn if NOP type code is emitted.
        (newfix): New parameter 'size', forward it to 'fix_new_exp'.
        (apply_fix): Call newfix with additional 'size' parameter.
        (build_bytes): Remove unused variable 'nib'.  Detect overflow in
        4 bit immediate arguments.
        (md_longopts): Add 'linkrelax' option.
        (md_parse_option): Adapt to new s_segm function.  Set 'linkrelax'
        variable when 'linkrelax' command line option is specified.
        (md_show_usage): Display 'linkrelax' option.
        (md_apply_fix3): Fix cases R_IMM4L, R_JR, and R_IMM8.  Add cases
        R_CALLR and R_REL16.
        * config/tc-z8k.h: Undef WARN_SIGNED_OVERFLOW_WORD.