Asynchronous IO system for Picos

This package provides an asynchronous IO system for Picos.

• Picos_io Basic IO facilities based on OCaml standard libraries for Picos.
• Picos_io_select Basic Unix.select based IO event loop for Picos.
• Picos_io_fd Externally reference counted file descriptors.

^{The IO libraries in this package are currently built only on top of the standard libraries distributed with OCaml and are hopefully useful for building simple applications.}