- merge luaL_typeerror into auxiliar to avoid using luaL prefix? 
- getsockname should also support IPv6, no?
- remove RCSID from files?
- shouldn't we instead make the code compatible to Lua 5.2
  without any compat stuff, and use a compatibility layer to
  make it work on 5.1?
- why 2.1.1 rather than 2.1?
- add what's new to manual
- should there be an equivalent to tohostname for IPv6?
- should we add service name resolution as well to
  getaddrinfo?
- document bind and connect behavior based on address?

- add functionality to query if object is ipv4 or 6?
- update copyright date everywhere? 
- what to do about author? 
- add http POST sample to manual
  people keep asking stupid questions
- documentation of dirty/getfd/setfd is problematic because of portability
  same for unix and serial.
  what to do about this? add a stronger disclaimer?
- remove references to Lua 5.0 from documentation, add 5.2?
- update lua and luasocket version in samples in documentation
- document headers.lua?
- fix makefile with decent defaults?

Done:

- document ipv5_v6only default option being set?
- document tcp6 and udp6
- document dns.getaddrinfo 
- document zero-sized send on udp vs. tcp?
  no.
- document unix socket and serial socket? add raw support?
  no.
- document getoption










replace \r\n with \0xD\0xA in everything
New mime support

ftp send should return server replies?
make sure there are no object files in the distribution tarball
http handling of 100-continue, see DB patch
DB ftp.lua bug.
test unix.c to return just a function and works with require"unix"
get rid of setmetatable(, nil) since packages don't need this anymore in 5.1
compat-5.1 novo
ajeitar pra lua-5.1

adicionar exemplos de expansão: pipe, local, named pipe
testar os options!


- Thread-unsafe functions to protect
    gethostbyname(), gethostbyaddr(), gethostent(),
inet_ntoa(), strerror(),