Added conformer Boltzmann weighting function

[aleksy-k]

---

Added a function in Conformers.py to Boltzmann weight the conformers. Conformers above a user-defined threshold will be removed (but we will keep the final conformer that takes it over the threshold)

Checklist

• [ ] The changes include an associated explanation of how/why
• [ ] Test pass
• [ ] Documentation has been updated
• [ ] Changelog has been updated

[codecov[bot]]

Codecov Report

Merging #255 (2e531bf) into master (ab7c768) will decrease coverage by 0.01%. The diff coverage is 37.28%.

@@            Coverage Diff             @@
##           master     #255      +/-   ##
==========================================
- Coverage   97.00%   96.99%   -0.01%     
==========================================
  Files         195      196       +1     
  Lines       19944    20255     +311     
==========================================
+ Hits        19346    19647     +301     
- Misses        598      608      +10     

Flag	Coverage Δ
unittests	96.99% <37.28%> (-0.01%)	:arrow_down:

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

Impacted Files	Coverage Δ
autode/conformers/conformers.py	84.21% <16.00%> (-15.79%)	:arrow_down:
autode/transition_states/locate_tss.py	74.67% <50.00%> (-7.34%)	:arrow_down:
autode/conformers/conformer.py	100.00% <100.00%> (ø)
autode/reactions/reaction.py	97.61% <100.00%> (+0.21%)	:arrow_up:
autode/wrappers/MOPAC.py	92.82% <0.00%> (-1.03%)	:arrow_down:
tests/test_wrappers/test_mopac.py	99.35% <0.00%> (-0.65%)	:arrow_down:
autode/wrappers/XTB.py	98.53% <0.00%> (-0.03%)	:arrow_down:
autode/atoms.py	100.00% <0.00%> (ø)
... and 35 more

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