Bnlearn

'bds': -57992.919156623604,
'bic': -94337.69274492635,
'bdeu': -33670.95375881856}

Fix for bug 105

Fix for bug "DBN" not in config found.

The impute functionality has been extended with the MICE method thanks to Ananyapam7 (issue 81).
In addition, I also added functionality to impute missing categorical values.

Key features include:
* Supports K-NN imputation for numeric columns.
* Supports MICE imputation for numeric columns.
* Numeric columns are auto-identified and converted for imputation where necessary.
* Includes options to specify the imputation estimator, number of iterations (max_iter), and verbosity level for logging.
* String/categorical columns are imputed.

Created a new file impute.py for imputation related functions.
See examples and more information in the [documentation pages](https://erdogant.github.io/bnlearn/pages/html/impute.html).

* bug fix when using parameter learning

* Lingam methods (Direct and ICA) are implemented to model datasets with continuous variables (without discretizing). See docs [here](https://erdogant.github.io/bnlearn/pages/html/Continuous%20Data.html). #36 94
* Plotting is now possible using Graphviz which creates more clear figures. See docs [here](https://erdogant.github.io/bnlearn/pages/html/Plot.html#static-plot-graphviz).
* For Constraint-based (PC), CII 9 tests are included and the alpha can be set.
* Parameter showfig and visible is available now for plotting 103
* Dynamic Bayesian Network (DBN) implemented. 100. See docs [here](https://erdogant.github.io/bnlearn/pages/html/bnlearn.bnlearn.html#bnlearn.bnlearn.make_DAG) and [here](https://erdogant.github.io/bnlearn/pages/html/bnlearn.parameter_learning.html#module-bnlearn.parameter_learning).
* Impute functionality implemented in case of missing values. 81 See docs over [here](https://erdogant.github.io/bnlearn/pages/html/impute.html).
* Updated docstrings and sphinx documentation pages.
* Created a logo! :-)