Feature/set distance tests

[ARandomTree]

Added tests for set distances.

Fixed an error in Jaccard similarities in the according distance class and in the bitvector class. If two empty Vectors were given, the similirarity was NaN but should have been 1 and the distance should be 0.

[codecov[bot]]

Codecov Report

Merging #67 into master will increase coverage by 0.13%. The diff coverage is 50%.

@@             Coverage Diff              @@
##             master      #67      +/-   ##
============================================
+ Coverage     49.85%   49.98%   +0.13%     
- Complexity    11548    11711     +163     
============================================
  Files          1667     1667              
  Lines         81655    81928     +273     
  Branches      14700    14765      +65     
============================================
+ Hits          40709    40953     +244     
+ Misses        37915    37914       -1     
- Partials       3031     3061      +30

Impacted Files	Coverage Δ	Complexity Δ
...a/elki/distance/set/JaccardSimilarityDistance.java	71.66% <50%> (+71.66%)	33 <0> (+33)	:arrow_up:
...i-core-data/src/main/java/elki/data/BitVector.java	18.91% <50%> (+3.46%)	14 <1> (+5)	:arrow_up:
.../main/java/elki/evaluation/clustering/Entropy.java	55.03% <0%> (-22.14%)	20% <0%> (-6%)
...evaluation/clustering/ClusterContingencyTable.java	31.75% <0%> (-12.8%)	9% <0%> (+1%)
...ki-core-math/src/main/java/elki/math/MathUtil.java	93.88% <0%> (-1.69%)	189% <0%> (+89%)
...re/src/main/java/elki/result/EvaluationResult.java	40.9% <0%> (-0.65%)	4% <0%> (ø)
...va/elki/result/textwriter/MultipleFilesOutput.java	0% <0%> (ø)	0% <0%> (ø)	:arrow_down:
...datasource/ConcatenateFilesDatabaseConnection.java	15.49% <0%> (+0.39%)	0% <0%> (ø)	:arrow_down:
...n/java/elki/utilities/datastructures/BitsUtil.java	72.69% <0%> (+1.61%)	206% <0%> (+4%)	:arrow_up:
...elki/evaluation/clustering/EvaluateClustering.java	10.34% <0%> (+2.23%)	0% <0%> (ø)	:arrow_down:
... and 10 more

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[kno10]

Closed with commit 28507c6157a493ce344673cd78a65b24c42a1996