Projects:

* Implement some basic windowing primitives as a library to allow
libscheme to be used as a UI prototyping tool.

* Implement rest of POSIX library.

* Implement a regexp library.

* Add string ports by abstracting the lower level level pieces of
scheme_read.c.

* Further reduce consing on function application.

Completed:

* POSIX file library.
* Generic input and output ports.
* Reduced consing on function application.
