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Reduce DICOM write time #4164

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Opening as a draft since this is a work in progress, with additional changes to both reading and writing planned.

4e81795 should reduce the total time to run bfconvert with DICOM output. This is just buffering the header writes, and does not change the tile writing. A simple test conversion using https://downloads.openmicroscopy.org/images/Vectra-QPTIFF/perkinelmer/PKI_scans/HandEcompressed_Scan1.qptiff:

bfconvert -no-upgrade -noflat -tilex 256 -tiley 256 -compression JPEG HandEcompressed_Scan1.qptiff test.dcm

is noticeably faster with 4e81795 when testing locally.

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