Remove bhmm as dependency

[codecov[bot]]

Codecov Report

Merging #1550 (0a99797) into devel (f6a7a7d) will decrease coverage by 1.74%. The diff coverage is 93.70%.

@@            Coverage Diff             @@
##            devel    #1550      +/-   ##
==========================================
- Coverage   92.08%   90.33%   -1.75%     
==========================================
  Files         229      229              
  Lines       26920    26912       -8     
==========================================
- Hits        24788    24312     -476     
- Misses       2132     2600     +468     

Impacted Files	Coverage Δ
pyemma/_base/serialization/pickle_extensions.py	88.29% <ø> (ø)
pyemma/coordinates/clustering/tests/util.py	75.86% <0.00%> (ø)
pyemma/msm/models/hmsm.py	93.95% <ø> (ø)
pyemma/msm/estimators/bayesian_hmsm.py	87.50% <58.82%> (-3.41%)	:arrow_down:
pyemma/msm/estimators/maximum_likelihood_hmsm.py	88.61% <96.77%> (+0.18%)	:arrow_up:
pyemma/_base/estimator.py	87.83% <100.00%> (+0.19%)	:arrow_up:
pyemma/coordinates/tests/test_traj_info_cache.py	19.03% <100.00%> (-79.58%)	:arrow_down:
pyemma/msm/tests/test_bayesian_hmsm.py	99.54% <100.00%> (-0.01%)	:arrow_down:
pyemma/msm/tests/test_cktest.py	99.30% <100.00%> (-0.09%)	:arrow_down:
pyemma/msm/tests/test_estimator.py	92.42% <100.00%> (ø)
... and 9 more

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[clonker]

merging this now, going to follow up with another PR to resolve hanging CI