Backproject errors during pipeline due to permissions error.

[den-sq]

Backproject pipeline fails after writing backprojection chunks due to a permissions error when clearing up temporary data:

File "C:\Dev\ouroboros\python\ouroboros\pipeline\backproject_pipeline.py", line 336, in _process
    shutil.rmtree(

PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: '\\\\wsl$\\Ubuntu\\mnt\\wsl\\PHYSICALDRIVE2p1\\B10\\Segmentations\\R4A_OC_T\\R4A_OC_BP.tif-tempvolumes\\0.tif

[den-sq]

Resolved by #10 .