Better support for non-zero lower bound arrays [v2]

This patchset improves the support for non-zero lower bound arrays. Specifically, the functions sort, sort!, restricted-vector-sort!, array-slice-for-each, and truncated-print from (ice-9 pretty print) now support non-zero lower bound arrays. The patchset also adds support for bitvectors in trunca

Better support for non-zero lower bound arrays

This patchset adds better support for non-zero lower bound arrays. Specifically, the functions sort, sort!, restricted-vector-sort!, array-slice-for-each, and truncated-print from (ice-9 pretty print) now support non-zero lower bound arrays. The patchset also adds support for bitvectors in