Warnings from newer GCC versions

[nemequ]

See https://travis-ci.org/nemequ/leopard/jobs/395897224

• tests/experiments.cpp warns about argc and argv and the encodeL function being unused. Trivial fixes.
• tests/benchmark.cpp warns about an implicit fallthrough. Fixes are available, but compiler-specific until C++17… see HEDLEY_FALL_THROUGH.

[nemequ]

FWIW, it's not just GCC; newer clang emits the same warnings. IIRC Coverity (and other analysis tools) will complain about the implicit fallthroughs too.

[catid]

Thanks for reporting these and sorry I'm slow to respond. Trying to stay focused on another long term project and get it out the door