Bug fixes:
- Allow registration on CFA SER sequences
- Processing monochrome images requires less memory, or can be more paralellized if memory was the limiting factor
- Fixed dark optimization
- Fixed free disk space detection and usual processing commands on 32-bit systems
- Fixed free memory detection for stacking in case of up-scaling ('drizzle') and memory distribution to threads
- Fixed bug in FFT module
- Fixed bug in the drawn circle of photometry
- Fixed build fail with OpenCV 4.0.1
- Fixed SER sequence cropping