Updates to likelihoods, bug fix GaussianLogLikelihood class

[BradyPlanden]

Description

• Fixes GaussianLogLikelihood for use with all optimisers,
• Adds GaussianLogLikelihood to integration testing,
• Updates non-bounded parameter logic,
• Bugfix CMAES construction where x0 is destroyed.
• Moves MAP to _likelihoods.py

Issue reference

Fixes #257

Review

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.72%. Comparing base (76b59f1) to head (ee73c2b).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #338      +/-   ##
===========================================
+ Coverage    97.47%   97.72%   +0.24%     
===========================================
  Files           42       42              
  Lines         2419     2502      +83     
===========================================
+ Hits          2358     2445      +87     
+ Misses          61       57       -4     

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[NicolaCourtier]

Hi @BradyPlanden, thanks for working on this issue! I have tried adding sigma as a Parameter in #352 - please can you take a look and see what you think of this alternative implementation?

[NicolaCourtier]

Great work, thanks @BradyPlanden! I left a few small comments but the implementation looks good overall.