maybe xdist is screwing up?

[richardjgowers]

Fixes #

Changes made in this Pull Request:

PR Checklist

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

[richardjgowers]

@MDAnalysis/coredevs ok so removing the --numprocesses=2 makes the travis build work again, and only increases the test times by about 1-2 min.

[orbeckst]

Let's do it... xdist has been a constant source of frustration

[orbeckst]

@richardjgowers can you tell the fine folks on the dev list to merge/rebase their failing PRs?

Thanks for diagnosing the problem.

[codecov]

Codecov Report

Merging #2145 into develop will decrease coverage by 0.19%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           develop    #2145     +/-   ##
==========================================
- Coverage    89.42%   89.23%   -0.2%     
==========================================
  Files          157      143     -14     
  Lines        18772    17473   -1299     
  Branches      2711     2711             
==========================================
- Hits         16787    15592   -1195     
+ Misses        1381     1277    -104     
  Partials       604      604

Impacted Files	Coverage Δ
topology/base.py
auxiliary/base.py
util.py
__init__.py
formats/__init__.py
visualization/__init__.py
coordinates/__init__.py
auxiliary/__init__.py
datafiles.py
core/__init__.py
... and 5 more

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