Switching to pylint

pylint is more powerful than flake8 and would combine the docstring linting and pep8 linting

the following modules still need adaptions

• umami.configuration.Configuration
• umami.evaluate_model
• umami.evaluation_tools.FeatureImportance
• umami.evaluation_tools.PlottingFunctions
• umami.helper_tools.histogram_tools
• umami.input_vars_tools.init
• umami.models.Model_Dips
• umami.models.Model_Dips_cond_att
• umami.models.Model_DL1
• umami.models.Model_Umami
• umami.plot_input_variables
• umami.plotting_epoch_performance
• umami.plotting_umami
• umami.preprocessing
• umami.preprocessing_tools.Configuration
• umami.preprocessing_tools.Convert_to_Record
• umami.preprocessing_tools.Cuts
• umami.preprocessing_tools.Merging
• umami.preprocessing_tools.Preparation
• umami.preprocessing_tools.Resampling
• umami.preprocessing_tools.Scaling
• umami.preprocessing_tools.utils
• umami.preprocessing_tools.Writing_Train_File
• umami.tests.integration.test_input_vars_plot
• umami.tests.integration.test_preprocessing
• umami.tf_tools.generators
• umami.tf_tools.layers
• umami.tf_tools.load_tfrecord
• umami.tf_tools.models
• umami.tf_tools.tools
• umami.tools.tools
• umami.tools.yaml_tools
• umami.train
• umami.train_tools.Configuration
• umami.train_tools.NN_tools
• umami.train_tools.Plotting