Main
====
 + Add plane/frame-number/broken metadata in the UFO buffers. Check propagation trough standard ufo filters. [ propogates trough processors, but not reductors ]
 + Plane selector filter
 - Handle packets with data from multiple datasets
 + Try UFO 'flat-field' correction filter [ works to a degree, but possible to make it better + anyway multiple planes will be needed later likely... ]
 - Compute flat-/dark-fields per plane. 
 - Support reading raw sinograms in get_reader (we need to set dimensions like in flat-/dark-fields, but howto handle parallel-sinograms/slices - function in config?)
 - Cone-beam to parallel-beam resampling ?
 - Full reconstruction chain
 - Try UFO visualization filter
 - "Reconstructed data storage" and "Visualization + raw data storage" modes. Implement stand-alone 'roof-converter' filter.

If necesary
===========
 - Task 'roof-ingest-missing' to ingest zero-padded broken frames (and include get_writer())
 - Add ROOF metadata (plane, etc.) if reading from sinograms
 
Optional
========
 - Try online compression of the ROOF data @Gregoire
 - Introduce JSON schema and JSON schema validator @Zhassulan
 - If neceessary, reconstruct slightly broken frames (currently dropped) @Zhassulan
 - Implement fast-writer filter for quick raw data storage
    * Either include plane in the file name or pass invalid frames trough (so we can compute the frame number)? 
 ? Support multi-plane configuration in the roof.py

Ufo bugs
========
 - Complain if TIF-writer is used with 1D data.

Ufo features
============
 ? Support non-fp data in UFO writer