Feature/cluster evaluation tests

[ARandomTree]

Added Tests for external cluster evaluation and fixed the selfpair parameter handling in the BCubed class.

[codecov[bot]]

Codecov Report

Merging #68 into master will increase coverage by 0.2%. The diff coverage is 0%.

@@             Coverage Diff             @@
##             master      #68     +/-   ##
===========================================
+ Coverage     50.08%   50.28%   +0.2%     
- Complexity    11721    11780     +59     
===========================================
  Files          1669     1669             
  Lines         81877    81877             
  Branches      14779    14779             
===========================================
+ Hits          41008    41172    +164     
+ Misses        37781    37615    -166     
- Partials       3088     3090      +2

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/elki/evaluation/clustering/BCubed.java	94.44% <0%> (+94.44%)	7 <0> (+7)	:arrow_up:
...rc/main/java/elki/clustering/kmedoids/FastPAM.java	95.09% <0%> (+0.98%)	4% <0%> (ø)	:arrow_down:
...i/distance/subspace/SubspaceEuclideanDistance.java	23.4% <0%> (+2.12%)	7% <0%> (+2%)	:arrow_up:
...ain/java/elki/logging/progress/FiniteProgress.java	86.48% <0%> (+5.4%)	21% <0%> (+1%)	:arrow_up:
.../main/java/elki/evaluation/clustering/Entropy.java	82.06% <0%> (+20.68%)	40% <0%> (+6%)	:arrow_up:
.../java/elki/evaluation/clustering/PairCounting.java	91.3% <0%> (+34.78%)	25% <0%> (+12%)	:arrow_up:
...evaluation/clustering/ClusterContingencyTable.java	81.37% <0%> (+37.25%)	20% <0%> (+10%)	:arrow_up:
.../java/elki/evaluation/clustering/EditDistance.java	93.33% <0%> (+93.33%)	11% <0%> (+11%)	:arrow_up:
.../elki/evaluation/clustering/SetMatchingPurity.java	100% <0%> (+100%)	10% <0%> (+10%)	:arrow_up:

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[kno10]

Rebased cleanly (duplicate commits, due to mixing rebase and merge), and merged as f52433bdbb4e591c51e856aa684cd5539eb56033