v0.4.0

• StringDBReport class for gene set visualization and reporting
• make sure da directions categories are always retained and ordered correctly
• more flexible volcano_de plot
• fold_change_mode parameter for heatmap to only show fold-change instead of split tiles
• implement RunInfo utility to fetch information about previous runs
• bugfix passing ax to kompot.plot.embedding
• implemented mgroups in kompot.plot.embedding to plot multiple groupings
• implement group-wise differential expression through groups parameter in kompot.compute_differential_expression
• also return and store uncertainty estimates (stds) in de analysis
• also return and store z-scores in de analysis
• implement underrepresentation filtering for de analaysis
• plot.embedding scanpy wrapper can now plot multiple layer
• make sure modified anndata is writable (use JSON for run info in .uns)
• option to store posterior covariance matrix in differential expression anndata function