Dtraj stats allow parallel no pg

[marscher]

• fix ci
• allow bmsm to set njobs for effective cmatrix estimation.
• added null_context (backport python 3.7)

[codecov[bot]]

Codecov Report

Merging #1375 into devel will increase coverage by 0.07%. The diff coverage is 77.77%.

@@            Coverage Diff            @@
##           devel    #1375      +/-   ##
=========================================
+ Coverage   91.6%   91.67%   +0.07%     
=========================================
  Files        223      223              
  Lines      25163    25177      +14     
=========================================
+ Hits       23050    23082      +32     
+ Misses      2113     2095      -18

Impacted Files	Coverage Δ
pyemma/msm/estimators/maximum_likelihood_msm.py	88.53% <ø> (-0.03%)	:arrow_down:
pyemma/_ext/variational/estimators/moments.py	91.11% <100%> (ø)	:arrow_up:
pyemma/coordinates/clustering/kmeans.py	94.19% <100%> (-0.08%)	:arrow_down:
pyemma/util/contexts.py	89.18% <100%> (+2.62%)	:arrow_up:
pyemma/msm/estimators/_dtraj_stats.py	85.38% <57.14%> (+2.14%)	:arrow_up:
pyemma/msm/estimators/bayesian_msm.py	95.23% <81.81%> (-4.77%)	:arrow_down:
...emma/_ext/variational/solvers/tests/test_direct.py	89.13% <0%> (-8.7%)	:arrow_down:
pyemma/coordinates/tests/test_traj_info_cache.py	97.38% <0%> (-0.37%)	:arrow_down:
pyemma/coordinates/tests/test_vamp.py	98.42% <0%> (+0.39%)	:arrow_up:
pyemma/coordinates/tests/test_nystroem_tica.py	99.18% <0%> (+0.81%)	:arrow_up:
... and 10 more

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