Issue 2232 psf bz2

[richardjgowers]

Fixes #2232

Changes made in this Pull Request:

• use self.filename rather than the .name attribute of the thing we open to workaround the bug with bz2files

I used a fixture to not have to add another file to the testsuite

PR Checklist

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

[codecov]

Codecov Report

Merging #2284 into develop will increase coverage by 0.09%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop    #2284      +/-   ##
===========================================
+ Coverage    89.55%   89.64%   +0.09%     
===========================================
  Files          156      172      +16     
  Lines        19410    21398    +1988     
  Branches      2785     2785              
===========================================
+ Hits         17382    19183    +1801     
- Misses        1432     1620     +188     
+ Partials       596      595       -1

Impacted Files	Coverage Δ
package/MDAnalysis/topology/PSFParser.py	87.82% <0%> (ø)	⬆️
package/MDAnalysis/analysis/psa.py	82.91% <0%> (-0.58%)	⬇️
core/util.py	100% <0%> (ø)
transformations/__init__.py	100% <0%> (ø)
auxiliary/base.py	89% <0%> (ø)
util.py	88.15% <0%> (ø)
topology/base.py	97.67% <0%> (ø)
__init__.py	91.89% <0%> (ø)
topology/__init__.py	100% <0%> (ø)
visualization/__init__.py	100% <0%> (ø)
... and 8 more

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[richardjgowers]

@MDAnalysis/coredevs this is good to go

[orbeckst]

lgtm – thanks!!