Modelly 1.2.0

Added

• Checkpoints: model.save(path), Model.load(path) and model.checkpoint_every(n, pattern).
  A run resumed from a checkpoint, in a new process, gives exactly the run it would have been:
  both random generators, the event scheduler, spaces, columns and collected data are saved.
  A checkpoint made with the compiled random core loads into the pure-Python one and the other
  way round. Loading runs pickle: only load files you trust. Lambdas and closures are refused
  with an error naming them.
• Versioned documentation: /Modelly/ is the latest release, /Modelly/dev/ is main and
  each minor release keeps its own folder (/1.0/, /1.1/, /1.2/), with a version switcher
  in the navbar and a banner on older versions.
• modelly profile --sizes 1000,4000 (and modelly.profile.compare_sizes) profiles a model
  at several population sizes and compares the cost per agent, so the MDL101 hint also works
  for models whose population does not change during a run.
• MetaAgents.cache_build(score): scores each candidate group once across repeated
  find_combinations calls, with invalidate() and an optional maxsize.
• Windows wheels (x86-64) with the compiled modules.

Changed

• modelly lint --help, modelly migrate --help and modelly profile --help name the
  command as it was run (modelly <cmd>, or python -m modelly.<cmd>).
• MDL107 follows imports of agent classes from other files in the linted tree, so models split
  into several modules are checked.
• A CellCollection built without a generator takes its cells' or agents' model generator, so
  the same seed gives the same draws.
• The creation path of meta agents returns MetaAgent instead of Any.

Performance

• Removing an agent that belongs to meta agents reads its own memberships instead of copying
  the whole membership table: 2,000 removals among 10,000 agents went from 100 s to 0.16 s.
• fastcell.c uses only the public C API, with the same speed as 1.1.0.
• The Sugarscape playbook ranks cells only when a forager's best cell is taken: 2.5x faster
  than in 1.1.0, 32x faster than Mesa 2.3 (was 12x), same results.

Fixed

• A continuous space restored from a pickle kept a copy of the agent positions, so later moves
  were lost; it now keeps a view.
• The empty-cell index keeps its order through pickling, so a restored grid draws the same
  empty cells.
• DataCollector reporters are picklable.