0.22:
  uh, the scope_id detection #defined the wrong constant.  libowfat
    always thought there was no scope_id.  Oops.
  #include <unistd.h> in io/io_sendfile.c (broken OpenBSD, thx Rob)
  add scan_urlencoded2 (like scan_urlencoded but will not convert '+' to
    ' '; needed for web servers, so they can serve libstdc++.tar.gz)
  fix iob_write to handle failure properly
  document that the iob_write callback should limit itself
  fix mmap_shared
  add iob_free, add man pages for iob_free and iob_reset
  fix descriptor leak in iob_addfile_close if the range was 0 (oops)