v0.6.0: Polynomials and GMM

[MartaVanin]

This PR has small changes but the following is breaking:

• GMM are not supported anymore via GaussianMixtures.jl but via MixtureModels from Distributions.jl This allows to remove the GaussianMixtures dependency.

Other, non-breaking:

• On the other hand, Polynomials.jl is added to the deps, and now polynomials logpdf, heslogpdf and gradlogpdf can be passed
• Finally, _PMDSE.rand for ExtendedBeta is extended to add AbstractRNGs, e.g., to fix seeds

[codecov[bot]]

Codecov Report

Merging #48 (6986057) into master (aadc48d) will decrease coverage by 7.36%. The diff coverage is 92.00%.

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
- Coverage   75.62%   68.25%   -7.37%     
==========================================
  Files          20       21       +1     
  Lines        1760     1761       +1     
==========================================
- Hits         1331     1202     -129     
- Misses        429      559     +130     

Impacted Files	Coverage Δ
src/PowerModelsDistributionStateEstimation.jl	100.00% <ø> (ø)
src/io/polynomials.jl	75.00% <75.00%> (ø)
src/io/distributions.jl	73.07% <93.33%> (-3.47%)	:arrow_down:
src/core/constraint.jl	89.47% <100.00%> (-2.64%)	:arrow_down:
src/bad_data/measurement_functions.jl	75.55% <0.00%> (-20.00%)	:arrow_down:
src/core/variable.jl	84.50% <0.00%> (-15.50%)	:arrow_down:
src/prob/se.jl	70.49% <0.00%> (-13.12%)	:arrow_down:
src/core/start_values_methods.jl	87.50% <0.00%> (-12.50%)	:arrow_down:
src/bad_data/utils.jl	88.54% <0.00%> (-11.46%)	:arrow_down:
src/form/reduced_ac.jl	18.75% <0.00%> (-9.38%)	:arrow_down:
... and 11 more

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[MartaVanin]

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