* A long-standing bug, which happened with
(let ([x (lazy (delay 1))]) (force x) (force x))
not being properly handled.
* Added `delay/strict', mostly for the below.
* Made srfi/45 reprovide it as `eager'.
* Also restricted the exports from srfi/45 to its interface.
All of these issues were reported by Andreas Rottmann.
* Switch srfi/1 and a few other packages (and optionals.ss) to
scheme/base
* Make srfi/1 etc reprovide `filter' from scheme/private/list
* Organize a few modules that were unnecessarily providing a full
language.
* srfi/45 reprovides stuff from scheme/promise (see comments in
"srfi/45/lazy.ss")
svn: r8999
