0.1.0

  Initial placeholder version.

0.1.2

  Add structs implementing GaloisField and constructors.

  Add README.md and unit tests.

0.1.3

  Add vector operations (no unit testing yet).

  Refine documentation.

0.1.4

  Add new guff::good module, to contain "reasonable" set of optimised
  maths implementations.

  Add optimised GF(2**4) implementation for field poly 0x13 there,
  backed by two generic lookup table types (for inv and mul).

  Fix bug in default implementation when calculating inverses in
  GF(2**4).

  Clean bill of clippy health.

0.1.5

  Start using Criterion for benchmarking.

  Benchmark guff::good gf(16) fields versus reference.

  Add good gf(2**8) implementation (+test/benchmark)

  Warning about exp not being used is OK (access via exp_entry).

  Surprisingly, log/exp implementation is not faster than reference.