Minimum mass for hydrogen guess in HydrogenBondAnalysis

[RMeli]

Fixes #2472

Changes made in this Pull Request:

• Added a min_mass parameter (set to 0.9 by default) to guess_hydrogens in HydrogenBondAnalysis

When the mass can't be guessed it is usually set to 0.0. This could lead to an erroneous identification of hydrogen atoms.

PR Checklist

• Tests?
• CHANGELOG updated?
• Issue raised/referenced?

[richardjgowers]

couple silly questions

[codecov]

Codecov Report

Merging #2516 into develop will increase coverage by 0.08%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #2516      +/-   ##
===========================================
+ Coverage    90.25%   90.33%   +0.08%     
===========================================
  Files          169      170       +1     
  Lines        23210    23146      -64     
  Branches      3008     2989      -19     
===========================================
- Hits         20948    20909      -39     
+ Misses        1655     1634      -21     
+ Partials       607      603       -4

Impacted Files	Coverage Δ
...age/MDAnalysis/analysis/hbonds/hbond_autocorrel.py	88.05% <ø> (+0.09%)	⬆️
package/MDAnalysis/analysis/hole.py	72.01% <ø> (+0.04%)	⬆️
package/MDAnalysis/analysis/lineardensity.py	81.81% <ø> (+18.51%)	⬆️
package/MDAnalysis/analysis/diffusionmap.py	93.33% <ø> (+2.56%)	⬆️
package/MDAnalysis/analysis/psa.py	83.68% <ø> (+0.63%)	⬆️
...DAnalysis/analysis/hydrogenbonds/hbond_analysis.py	95.45% <100%> (+0.08%)	⬆️
package/MDAnalysis/coordinates/NAMDBIN.py	100% <100%> (ø)
...ckage/MDAnalysis/analysis/hbonds/hbond_analysis.py	81.6% <100%> (+0.78%)	⬆️
package/MDAnalysis/analysis/rms.py	92.8% <100%> (+0.13%)	⬆️
package/MDAnalysis/analysis/contacts.py	100% <100%> (ø)	⬆️
... and 18 more

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[IAlibay]

Couple of test suggestions.