bug#22768: Crash safety

[Paul Eggert]

Antonio Diaz Diaz wrote:
> I am considering a different approach for lzip; adding a new option, say '-y,
> --fsync', to call fsync when acting in-place. This provides safety to those
> needing it without slowing down the work of everybody else. Especially of those
> (de)compressing a lot of replaceable files in-place.

Yes, I considered an --fsync option as well, but worried about making the 
default unsafe. How about if gzip and lzip instead add a --no-fsync option for 
people who don't need the safety?