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This is a snapshot of the 'stable' state that IDG has been in over the last couple of months, including some recent fixes for compatibility with recent versions of DP3, Everybeam and WSClean.

Bugfixes:
- CUDA gridder: large number of channels
- CUDA gridder: few timesteps per subgrid
- CUDA degridder: Stokes-I submode
- CUDA gridder + degridder: out-of-bounds reads
- Plan: visibility count and jobsize
- CPU W-Tiling: forward/backward FFT swapped
- Add workaround for CUDA profiler errors

New features:
- Add optional phasor extrapolation feature for CUDA kernels
- Add Python CUDA kernel tests

Miscellaneous:
- Use current versions of Everybeam, DP3 and WSClean in CI
- Fix idg-cal for current DP3/Everybeam
- Remove schaap-stack from CI
- Move to new servers for documentation and CI data
- Update SKA CI to use k8srunner-gpu runner
- Remove deprecated OpenCL code
- Restore support for Maxwell GPU architecture 
- Various cleanup and improvements to CUDA kernels