PRFO TS optimiser improvements

[t-young31]

Closes #195 #196 #197

---

TODO

• Update changelog
• Up codecov

[codecov]

Codecov Report

Merging #199 (4d68fa9) into v1.3.3 (f383408) will increase coverage by 0.02%.
The diff coverage is 97.88%.

@@            Coverage Diff             @@
##           v1.3.3     #199      +/-   ##
==========================================
+ Coverage   96.97%   97.00%   +0.02%     
==========================================
  Files         195      195              
  Lines       19863    19944      +81     
==========================================
+ Hits        19263    19346      +83     
+ Misses        600      598       -2     

Flag	Coverage Δ
unittests	97.00% <97.88%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
autode/config.py	100.00% <ø> (ø)
autode/species/species.py	99.20% <ø> (ø)
setup.py	0.00% <ø> (ø)
autode/transition_states/transition_state.py	62.66% <83.33%> (ø)
autode/opt/optimisers/base.py	98.69% <94.73%> (+0.06%)	⬆️
autode/opt/optimisers/prfo.py	97.50% <96.15%> (+0.27%)	⬆️
autode/__init__.py	100.00% <100.00%> (ø)
autode/calculations/executors.py	98.37% <100.00%> (+0.02%)	⬆️
autode/opt/coordinates/cartesian.py	100.00% <100.00%> (ø)
autode/opt/coordinates/dic.py	100.00% <100.00%> (ø)
... and 9 more

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