v1.6

• New binding IO_fcntl with corresponding constants in IO
  (this is necessary for switching a file descriptor to O_NONBLOCK)
• In IO_WriteNonBlocking only try to send PIPE_BUF bytes instead
  of full buffer to avoid blocking (is this the solution?)
• Functionality to pipe a string through an external command
  using I/O multiplexing
• New client side HTTP protocol implementation
• Use chapters in documentation
• New functions IO_PipeThrough and IO_PipeThroughWithError to pipe
  a string through a process.
• Released version 1.6: 16.11.2006