GNM MassWeight removal

[IAlibay]

Part of changes required for #2443

Changes made in this Pull Request:

• Removed MassWeight from gnm.py

PR Checklist

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

[IAlibay]

As far as I am aware, this is the only part of the analysis methods that was commented for deprecation for a version prior to 1.0 (0.17 in this case).

[codecov]

Codecov Report

Merging #2479 into develop will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #2479      +/-   ##
===========================================
+ Coverage    90.23%   90.25%   +0.02%     
===========================================
  Files          179      179              
  Lines        23284    23281       -3     
  Branches      3010     3009       -1     
===========================================
+ Hits         21010    21012       +2     
+ Misses        1666     1662       -4     
+ Partials       608      607       -1

Impacted Files	Coverage Δ
package/MDAnalysis/analysis/gnm.py	96.06% <ø> (-0.1%)	⬇️
package/MDAnalysis/lib/util.py	88.56% <0%> (+0.29%)	⬆️
package/MDAnalysis/coordinates/TRJ.py	94.87% <0%> (+0.76%)	⬆️

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[richardjgowers]

thanks @IAlibay gotta love the net negative linechange PRs!

[IAlibay]

thanks @IAlibay gotta love the net negative linechange PRs!

Give me ~ a day, there's plenty of removals that need to get done for 1.0 😅