Feature/internal cluster evaluation tests

[ARandomTree]

Added tests for internal cluster evaluation fixed bugs found in internal cluster evaluation added a warning to EvaluateDaviesBouldin for the use of TREAT_NOISE_AS_SINGLETONS

[codecov[bot]]

Codecov Report

Merging #71 into master will increase coverage by 0.63%. The diff coverage is 44.44%.

@@             Coverage Diff              @@
##             master      #71      +/-   ##
============================================
+ Coverage     50.57%   51.21%   +0.63%     
- Complexity    11862    12041     +179     
============================================
  Files          1674     1674              
  Lines         82225    82230       +5     
  Branches      14889    14890       +1     
============================================
+ Hits          41586    42113     +527     
+ Misses        37514    36921     -593     
- Partials       3125     3196      +71

Impacted Files	Coverage Δ	Complexity Δ
...i/evaluation/clustering/internal/EvaluateDBCV.java	82.56% <0%> (+77.98%)	30 <0> (+30)	:arrow_up:
...ion/clustering/internal/EvaluateDaviesBouldin.java	60.21% <0%> (+47.02%)	11 <0> (+11)	:arrow_up:
...aluation/clustering/internal/EvaluatePBMIndex.java	65% <80%> (+54.61%)	17 <0> (+17)	:arrow_up:
...i-core-api/src/main/java/elki/result/Metadata.java	69% <0%> (+1%)	28% <0%> (ø)	:arrow_down:
...in/java/elki/clustering/kmeans/AbstractKMeans.java	79.85% <0%> (+1.11%)	23% <0%> (ø)	:arrow_down:
...i/distance/subspace/SubspaceEuclideanDistance.java	23.4% <0%> (+2.12%)	7% <0%> (+2%)	:arrow_up:
...c/main/java/elki/clustering/kmedoids/FastPAM1.java	96.18% <0%> (+2.29%)	4% <0%> (ø)	:arrow_down:
...rc/main/java/elki/clustering/kmedoids/FastPAM.java	94.17% <0%> (+2.91%)	4% <0%> (ø)	:arrow_down:
...ava/elki/clustering/trivial/ByLabelClustering.java	83.33% <0%> (+4.54%)	16% <0%> (+2%)	:arrow_up:
...re/src/main/java/elki/result/EvaluationResult.java	58.53% <0%> (+8.53%)	6% <0%> (ø)	:arrow_down:
... and 12 more

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[kno10]

merged in 7f5423f4ba962cebed7b696017f034bcaa227f98