New features:
- New photometric color calibration tool
- New background extraction tool working with 64-bit precision and dither
- New image filtering for sequence processing: now possible from the command line and with multiple filters
- New GTK+ theme settings: it can now be set from siril to dark or light, or kept to automatic detection
- New normalization to 16 bits for RAW images with less dynamic range (in general 12 or 14).
- Added drag and drop capability in the conversion treeview
- Added output file name argument to stacking commands
- New command setmem to limit used memory from scripts
- New clear and save buttons for the log in GUI
- Added German translation