HLL unit tests

Issue #99: Added HyperLogLogLength that takes array of HLL keys

Fixup the `[InternalsVisibleTo]` (glitched on strong-name version, but not needed);  include Moq dlls - this is purely to make my build-server happy

Key space isolation tests

Minor change to WrapperBase

Merge new stuff

fix minor mistype on comment.

Update KeysScan.md

Add basic tests for keyspace isolation; use polymorphism for Condition re-writing; slight tweaks to wrapper construction (no double-wrapping, for example)

Key space isolation extension to IDatabase

Critical fix: ReconfigureAsync was incorrectly spinning up new ServerEndPoint instances after disconnect

fix typo