Adds unwrap keyword to principal_axes

[NinadBhat]

Fixes #

Changes made in this Pull Request:

PR Checklist

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

[NinadBhat]

@richardjgowers @jbarnoud Is there a reason for using atomgroup = group.atoms
in place of directly using group.moment_of_inertia?

[richardjgowers]

Here it should be fine since MOI is doing the conversion. In general these methods are attached to all groups, so ResidueGroup too, but they want to operate on atoms. So for a RG, atomgroup = group.atoms is converting to an AtomGroup within the method.

[codecov]

Codecov Report

Merging #2295 into develop will decrease coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #2295      +/-   ##
===========================================
- Coverage    89.66%   89.65%   -0.01%     
===========================================
  Files          172      172              
  Lines        21421    21421              
  Branches      2792     2792              
===========================================
- Hits         19208    19206       -2     
- Misses        1616     1617       +1     
- Partials       597      598       +1

Impacted Files	Coverage Δ
package/MDAnalysis/core/topologyattrs.py	97.78% <100%> (ø)	⬆️
package/MDAnalysis/core/universe.py	94.42% <0%> (-0.56%)	⬇️

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[orbeckst]

@NinadBhat @richardjgowers what is missing to merge this PR?

[NinadBhat]

@orbeckst I was waiting for #2299 to be merged. Once that is merged I will merge develop into this PR and resolve the conflicts.
I am updating Projects Page, which contain the PRs that need to be reviewed and merged.

[orbeckst]

Ok, thanks. Good idea to focus on the things are blocking others.