[PATCH] Add srfi-171 to guile

[Linus Björnstam]

Hi there!

This is a patch to add srfi-171 (transducers) to guile. 

It adds the srfi implementation, a guile-specific extension (tfold and tbatch 
which can be used to generalize things like tsegment), documentation (the whole 
srfi document plus additions into srfi-modules.texi) and tests. 

I have built it successfully on the latest master. This would be my first ever 
commit to a project I did not start myself, with the added bonus that I have no 
idea of how git works. Be kind :)

Happy holidays! 
  Linus Björnstam

0001-Added-srfi-171-to-guile-under-the-module-name-srfi-s.patch
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0002-Added-documentation-and-tests-for-srfi-171.patch
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