[plt-dev] Some R6RS SRFI patches

Hi!

Here are a few patches regarding R6RS-compatible SRFIs:

- SRFI 6: Operate on R6RS ports
- SRFI 13: Fix `string-tokenize' return value
- SRFI 67: Use R6RS language (and hence mutable pairs)
- SRFI 98: Provide named alias library (srfi :98 os-environment-variables)

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