[config] forcefully enable coordinates_check_output

[marscher]

If there is a bug in mdtraj, it is much easier to hunt it down,
when this setting is not a user choice. The performance impact is
minimal.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (devel@4f77b84). Click here to learn what that means.
The diff coverage is 100%.

@@           Coverage Diff            @@
##             devel    #1384   +/-   ##
========================================
  Coverage         ?   91.49%           
========================================
  Files            ?      225           
  Lines            ?    25448           
  Branches         ?        0           
========================================
  Hits             ?    23283           
  Misses           ?     2165           
  Partials         ?        0

Impacted Files	Coverage Δ
pyemma/util/_config.py	83.4% <100%> (ø)

---

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (devel@4f77b84). Click here to learn what that means.
The diff coverage is 100%.

@@           Coverage Diff            @@
##             devel    #1384   +/-   ##
========================================
  Coverage         ?   91.55%           
========================================
  Files            ?      225           
  Lines            ?    25450           
  Branches         ?        0           
========================================
  Hits             ?    23302           
  Misses           ?     2148           
  Partials         ?        0

Impacted Files	Coverage Δ
pyemma/coordinates/tests/test_readers.py	99.51% <100%> (ø)
pyemma/util/_config.py	84.25% <100%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4f77b84...13e4e67. Read the comment docs.