Python-weka-wrapper3

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- method `create_instances_from_matrices` from module `weka.core.dataset` now works with pure numeric data again
- added sections for creating datasets (manual, lists, matrices) to examples documentation

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- added console scripts: `pww-associator`, `pww-attsel`, `pww-classifier`, `pww-clusterer`, `pww-datagenerator`, `pww-filter`
- added `serialize`, `deserialize` methods to `weka.classifiers.Classifier` to simplify loading/saving model
- added `serialize`, `deserialize` methods to `weka.clusterers.Clusterer` to simplify loading/saving model
- added `serialize`, `deserialize` methods to `weka.filters.Filter` to simplify loading/saving filter
- added methods `plot_rocs` and `plot_prcs` to `weka.plot.classifiers` module to plot ROC/PRC curve on same dataset
for multiple classifiers
- method `plot_classifier_errors` of `weka.plot.classifiers` module now allows plotting predictions of multiple
classifiers by providing a dictionary
- method `create_instances_from_matrices` from module `weka.core.dataset` now allows string and bytes as well
- method `create_instances_from_lists` from module `weka.core.dataset` now allows string and bytes as well

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- added wrapper classes for association classes that implement `AssociationRuleProducer`
(package `weka.associations`): `AssociationRules`, `AssociationRule`, `item`
- added `to_source` method to `weka.classifiers.Classifier` and `weka.filters.Filter`
(underlying Java classes must implement the respective `Sourcable` interface)

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- fixed logging setup in `weka.core.jvm` to avoid global setting global logging
setup to `DEBUG` (thanks to https://github.com/Arnie97)

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- upgraded to Weka 3.9.3
- `weka.jar` now included in PyPi package
- exposed the following methods in `weka.classifiers.Evaluation`:
`cumulative_margin_distribution`, `sf_prior_entropy`, `sf_scheme_entropy`

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- upgraded to Weka 3.9.2
- properly initializing package support now, rather than adding package jars to classpath
- added `weka.core.ClassHelper` Java class for obtaining classes and static fields, as
javabridge only uses the system class loader