Fixes for LogPosterior w/ GaussianLogLikelihood

[BradyPlanden]

Description

Bug fixes for LogPosterior to integrate with transformed GaussianLogLikelihood.

Issue reference

Fixes # (issue-number)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.04%. Comparing base (ed457ff) to head (4f926ef).
Report is 113 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #505   +/-   ##
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  Coverage    99.04%   99.04%           
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  Files           52       52           
  Lines         3559     3560    +1     
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+ Hits          3525     3526    +1     
  Misses          34       34           

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[BradyPlanden]

This is extended to ensure the logpdf of the uniform prior is finite across the search space.

[martinjrobins]

looks good @BradyPlanden, just a comment for a fix on the posterior class (which to be fair existed before this PR!)