Bug fixes + unit test corrections; cleanup.

Better ARM support, update for stricter compilers.

Simple LPCQF addition for approximate counting. Supports general log …

…base.

Small SIMD countgtlt improvements, propagate SetSketchIndex and SetSk…

…etch improvements from Dashing2

More documentation for Python bindings. Move pcount_eq and ccount_eq …

…into python sketch namespace.

Runtime improvements + bug fixes; addition of constexpr reversible ha…

…sh functions + LSH index for both bottom-k and k-hash sketches.

countgtlt_nibbles fix

For BagMinHash and ProbMinHash resetting, this causes weight counting…

… to go back to 0 after reset() calls.

Constexpr reversible hashing

v0.16.1: Use Kahan summation in exponential draws, faster OMH, and ad…

…d gtlt_words to count_eq.h