lib/srfi/231/base.scm:
1. Add argument checks for index-first, index-last, index-rotate, and index-swap.
lib/srfi/231/test.sld:
1. 1,$s/179/231/g (in vim notation)
2. Add tests for index-first, index-last, index-rotate, and index-swap.
3. Remove trailing spaces.
Makefile:
When installing chibi, make installation directory and install files for SRFI 231.
When uninstalling chibi, remove installation directory and files for SRFI 231.
lib/srfi/231/transforms.scm:
Move definition of vector-iota from here to ...
lib/srfi/231/base.scm:
Here.
lib/srfi/231/base.sld:
Export vector-iota to use in both base.scm and transforms.scm.
