add Lwt_io.flush_all
add Lwt_io.flush_all

Ignore-this: f79236d775b81a0ff7d78915be60ea59

darcs-hash:20110815083116-c41ad-c73f7864aa8b840b1f0c342caa113117ca96afef

rgrinberg/lwt,rgrinberg/lwt,rgrinberg/lwt,c-cube/lwt,fdopen/lwt,ocsigen/lwt,gfxmonk/lwt,mfp/lwt,fdopen/lwt,janestreet/lwt-async,mirage/lwt,rneswold/lwt,c-cube/lwt,mfp/lwt,ocsigen/lwt,rneswold/lwt,rgrinberg/lwt,gfxmonk/lwt,c-cube/lwt,rneswold/lwt,mirage/lwt,janestreet/lwt-async,ocsigen/lwt