[plt-scheme] A couple of SRFI patches, one addition to R6RS ports

Hi!

(Please see the headers of the attached patches for details).

- Fix for the R6RS version of SRFI-14
- Implementation of SRFI-0 and SRFI-98 (missing up-to-date)

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Note that in the current version of the SRFI-0 patch, SRFI-98 is not
marked as available, if the SRFI-98 patch would go in, the corresponding
line should be updated. SRFI-0 might be a somewhat controversial topic;
if it is (or has been) decided that it shouldn't be in PLT, I'd
appreciate pointers to relevant disccusions.

Additionally, a hack to the R6RS ports implementation, to make the
underlying mzscheme port accessible:

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Regards, Rotty
-- 
Andreas Rottmann -- <http://rotty.yi.org/>