v0.16.0

I'm working on UIntXL (#33), but I fixed a crash – so here's an update.

GitHub (v0.15.0...v0.16.0)

• #112 No #if DEBUG unit testing
• #111 Crash in radix 3 integer description
• #109 Big integer Fibonacci sequence
• #108 Big integer Karatsuba algorithm
• #107 Req. init?(magnitude:)
• #106 Req. static binary integer one

Changes

+ init?(magnitude:)
+ static var one: Self { get }