Merge branch 'merge_prep_utest' into felix_TF2_merge_test

.coveragerc

mlair/data_handler/data_handler_mixed_sampling.py

mlair/data_handler/data_handler_single_station.py

mlair/data_handler/data_handler_with_filter.py

mlair/helpers/__init__.py

mlair/helpers/filter.py

mlair/helpers/helpers.py

mlair/helpers/testing.py

mlair/model_modules/convolutional_networks.py

mlair/model_modules/fully_connected_networks.py

mlair/model_modules/recurrent_networks.py

mlair/plotting/abstract_plot_class.py

mlair/plotting/data_insight_plotting.py

mlair/plotting/postprocessing_plotting.py

mlair/run_modules/post_processing.py

mlair/run_modules/pre_processing.py

test/test_helpers/test_filter.py

test/test_helpers/test_helpers.py

test/test_helpers/test_statistics.py

test/test_helpers/test_testing_helpers.py