2023.2

Version 2023.2 (2023-08-14)

• Based on VkFFT 1.3.1
• Add support for more than 3 FFT dimensions (defaults to 8
  in pyvkfft, can be changed when installing)
• Add options to manually or automatically tune the FFT performance
  for the used GPUs.
• Add pyvkfft-benchmark script.
• The VkFFT source is now included as a git subproject
• Actually use cuda_stream parameter in the pyvkfft.fft interface
• Take into account current cuda device when automatically
  caching VkFFTApp using the pyvkfft.fft interface(#26)
  This enable using multiple GPUs in a multi-threaded approach.
• The pyvkfft-test will ignore the PoCL OpenCL platform if
  another is available and unless it is explicitly selected.