Ikarus Scheme 0.0.4

What's new:

* With the exception of five procedures and the "|" mantissa
  size notation, Ikarus now supports all of R6RS. Ikarus now
  supports complex numbers, thus has complete numeric tower.

* Ikarus now includes a CP0-based optimization pass.
  CP0 is described in Oscar Waddell's Ph.D. dissertation.

* Ikarus can now compile and reload libraries to/from disk.
  All library dependencies can be compiled with one command:
     $ ikarus --compile-dependencies <r6rs-script-name>
  which compiles and serializes all libraries that the script
  depends on (based on the script's imports and expansion).

* Interprocess communication facilities are added.
  This includes communicating with a child subprocess's stdin,
  stdout, and stderr ports, as well as communicating with a
  remote process via TCP and UDP sockets. The communication
  facilities support both blocking and nonblocking ports that
  allow servicing many processes concurrently.

* Basic foreign-function-interface (FFI) facility is added.
  It provides accessors and mutators for manipulating native
  data structures. It also supports two-way procedure calls
  between Scheme and the native libraries.

* 158 issues (bug fixes, feature requests, typos, etc.) have
  been closed.