TCP_NODELAY is now enforced when calling setsockopt(), too.
Also, the NODELAY environment variable is read at startup
and may be used to force TCP_NODELAY to be _off_ for testing
purposes. Thanks to Leonid Evdokimov for these changes.
The project is now dual-licensed under the GPLv2 and LGPLv3
for compatibility with GPLv2-only applications.