v0.5.0

Another language feature update. The REPL is mostly unchanged, except for the ?help strings.

• Iterative block functionality called "procedures", which execute on a single item in an iterator (like the body of a for loop) iterable.{...}
• Lots of new single-item operations and framework changes, see ?procedures
• Uniqueness filters unique and unique field (undocumented)
• Minor bugfixes

Releases have been removed due to some other bugs not included in the bugfixes

Full Changelog: v0.4.0...v0.5.0