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KristofferC 
Tests for correct Pre/Semi/Metric subtyping (#68)

* test_dists.jl: Fixes errors that could arise in the unlikely event that all values in p are < 0.3.

* Introduce tests to make sure that claims of PreMetric, SemiMetric and Metric-ness for the distance measures are justified.

* Improved and more widespread fix to problem of fixed 0.3 threshold for setting p to 0.

* Tidying test code to standard julia style used in rest of package of using .0 at end of floating point and not just .

* Force exact computation of tests, which now results in test failures.

* Individual columns of P matrix can still be zero, so fix to remove elements per column.

* Removing duplicated tests for equality with zero now we have PreMetric tests.

* Improve documentation by describing argument types of distance measures.

* Removing floating point rounding errors (sum(p) != 1) in RenyiDivergence causing v small negative divergences. RenyiDivergence now internally normalises arguments.

* Add in some extra checks for RenyiDivergence, and remove one which no longer applies post-normalisation.

* CosineDist and CorrDist can both have small rounding errors - corrected for now by increasing error tolerance.

* Add length match check for Bhattacharyya and Mahalanobis distances, especially since Bhattacharyya guarantees this using @inbounds.

* Add in metric-ness tests for Jaccard, SpanNormDist and RogersTanimoto.

* Update benchmarks to include Renyi divergences, and pass them probability distributions.

* Update benchmark processor information.

* Add in new DimensionMismatch checks to confirm implementation.

* Fix indentation problems.

* typo

* More indentation fixes - mostly to make @testsets indent.

* Remove a final equal-to-zero test.

* Fixed indent.

* There are more rounding errors resulting in dxz ≤ dxy + dyz failing because dxz ≈ dxy + dyz but on the wrong side of the equality. For the time being, we just need to accept this.

* Fix README.md argument explanation.

* Indent.

* Add in Renyi divergence docs.

* Add in new DimensionMismatch checks to confirm implementation.

* Fix indentation problems.

* typo

* More indentation fixes - mostly to make @testsets indent.

* Remove a final equal-to-zero test.

* Fixed indent.

* There are more rounding errors resulting in dxz ≤ dxy + dyz failing because dxz ≈ dxy + dyz but on the wrong side of the equality. For the time being, we just need to accept this.

* Fix README.md argument explanation.

* Indent.

* Add in Renyi divergence docs.

* Fix benchmarks.

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Source Files on job 210.3