todo

这是一个非常有价值的参考代码

- Man page needs updated for avr910 info.

- Website needs to link to docs:
  http://savannah.nongnu.org/download/avrdude/doc/avrdude-html/

- Add "skip empty pages" optimization on avr910 paged write. The stk500 has
  this optimization already.

- Fix "overfull \hbox" issues in building documentation.

- FIXME: term.c: terminal_get_input(): strip newlines in non-readline input
  code.

- FIXME: avr910.c: avr910_cmd(): Insert version check here.

- FIXME: ser_posix.c: serial_close(): Should really restore the terminal to
  original state here.

- FIXME: main.c, par.c: exitspecs don't work if RESET-pin is controlled over
  PPICTRL.

- transfer ppi-speedtuning to the windows version (CAVEAT: This will make
  programming too fast for chips with 500kHz clock)

- make SCK-period configurable for PPI-programmers