Clean up code and docs; InitialiseKEK->InitializeKEK.
Update package docs to describe the KEK functionality.
Improve KEK tests; add benchmarks.

* The KEK test now generates a pair of key lists, and ensures that both
  lists get the same key (simulating two communicating parties).
Added signature for changeset cad69200763c
Added signature for changeset 5ec83bad3c14