Allowing xtol and ftol stopping criteria in OptimisationController

[MichaelClerx]

Closes #1502

• ftol is already possible, using set_max_unchanged_iterations(1, ftol)
• xtol can now similarly be implemented with set_max_unmoved_iterations(1, xtol)
• Moved part of stopping criteria code out of run(), as per Refactor MCMCController.run() and OptimiserController.run() #919

[MichaelClerx]

@martinjrobins @chonlei @mirams can you have a look and see if this makes sense, before I add tests?

[MichaelClerx]

Fine, we can just go with long names

• set_max_unchanged_function_iterations
• set_max_unchanged_parameter_iterations
• Make "unchanged_iterations" be a deprecated alias of unchanged_function_iterations
• Add better tests for stopping criteria

[MichaelClerx]

Fine, we can just go with long names

* [ ]  set_max_unchanged_function_iterations

* [ ]  set_max_unchanged_parameter_iterations

* [ ]  Make "unchanged_iterations" be a deprecated alias of unchanged_function_iterations

Going to do this next week, merge it in, and do a new release that's compatible with latest numpy #1712 unless anyone has strong objections @mirams @martinjrobins @chonlei ?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (7594349) to head (3949338).
⚠️ Report is 17 commits behind head on main.

Additional details and impacted files

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##              main     #1508   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           97        97           
  Lines         9704      9741   +37     
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+ Hits          9704      9741   +37     

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[MichaelClerx]

@mirams @martinjrobins @chonlei last chance to object to these names and name changes! If I don't hear anything I'll merge this tomorrow evening

[MichaelClerx]

Some alternatives suggested here: #1678 (comment)

General vibe there: use function_tolerance and parameter_tolerance. Several upvotes. So going for that