libxo-0.7.0
- Add --enable-int-return-codes for users that want the old API
- Add xo_options.7
- Can't start line with "--enable-warnings" or oxtradoc gets cornfuxed
- Protect redef of HOST_NAME_MAX
- Use attribute for linux PRINTFLIKE
- add flush-line and flush
- add verbose option info
- fix "- " in docs
- fix size_t/int issues (#55)