work around lack of sqlite3_next_stmt on Mac OS X 10.5.*
fix problem resizing mutable hash tables

A hash-table size grew based on the number of key slots occupied,
instead of the number of value slots, where the two differ when
keys are added and removed in the table.

Thanks to Ryan for the example.
raco setup: quieter output on a build step for user-scope docs
Post-release version for the v6.0 release