v0.5.0

• comprehensive FDR implementation for differential expression analysis
• FDR-based visualization in volcano_de plots: support for local/tail FDR y-axes and coloring
• posterior tail probability for differential expression
• introduction of "is_de" boolean column in adata.var to indicate differential expression based on significance threshold
• more flexible volcano_de plot with FDR/PTP-based thresholding and y-axis options
• "signal" and "strength" columns in stringDB gene-set enrichment analysis
• expand testing
• rename fields to include comparison, e.g., "A_to_B", before statistic name
• make de significance measures tail fdr, ptp, and zscore optional
• implement cleanup function
• bugfix: Prevent silent failure of compute_differential_abundance with sample variance
  by making sure enough space is available on disk for covariance tensor.
• dry run for differential expression
• split tutorials in 3 parts
• reduce memory demand when using batching and reflect this in dry run
• fix disk space checking to respect TMPDIR environment variable consistently
• include all computed results in full results dictionaries (std, fiel names, etc.)