add developments to release v1.5.0

See merge request !353

Resolve "raise ValueError in remove_nan(), if data is NaN only"

See merge request !325

Resolve "Feature Importance use unaggregated results"

See merge request !345

Merge branch 'lukas_issue337_bug_ci-pipeline-fails-for-docs' into 'lukas_issue335_refac_feature-importance-use-unaggregated-results'

try fix to use docutils with version<0.18

See merge request !348

Resolve "CI pipeline fails for docs"

See merge request !347

name of pdf starts now with feature_importance, there is now also another separated vars plot for single input feature importance

Resolve "make kzf filter running for climate fir filterc data handler"

See merge request !344

Resolve "Test Set Sample Uncertainty in PostProcessing"

See merge request !337

Resolve "report error metrics for all competitors"

See merge request !336

Merge branch 'issue333_feat_test-set-sample-uncertainty' of gitlab.jsc.fz-juelich.de:esde/machine-learning/mlair into issue333_feat_test-set-sample-uncertainty

Merge remote-tracking branch 'origin/issue333_feat_test-set-sample-uncertainty' into issue333_feat_test-set-sample-uncertainty

Merge branch 'issue333_feat_test-set-sample-uncertainty' of gitlab.jsc.fz-juelich.de:esde/machine-learning/mlair into issue333_feat_test-set-sample-uncertainty

Merge branch 'issue333_feat_sample-uncertainty-rename-feature-importance-bootstrap' into 'issue333_feat_test-set-sample-uncertainty'

Resolve "Test Set Sample Uncertainty in PostProcessing"

See merge request !341