new upstream stable release
    
    * the value of exponent expressins which equal zero (like 0^(0) or 0^zero
      where zero is a variable with value 0) is now 1, just like 0^0
    
    * Calc shell scripts now need to be called with and -s -f at the end of the
      shebang #! line.
    
    * set ARCH_CFLAGS to nothing, because otherwise it will now default to
      putting -march=native in there, which reduces portability and may conflict
      with rpm opt flags.