0.5.0

• Renamed smc to mc and mcmc-gan to mcmc, in both the API and CLI.
  We're not really doing SMC, and the MCMC isn't really a GAN.
• Used KDE reflection in the violin plots, to ameliorate the reduction
  in density near the edges of the support. This was already implemented
  for the hist plots.
• Fixed iteration numbering in plots to start at zero.
• Fixed broken pipe when piping dinf-tabulate output to, e.g., head.
• Updated the tutorial in the docs.