This update for orthanc-wsi fixes the following issues:

Version 2.1 

  * Support of sparse encoding of tiles in OpenSlide (notably for MIRAX format)
  * OrthancWSIDicomizer supports plain TIFF, besides hierarchical TIFF
  * New option: "--force-openslide" to force the use of OpenSlide on TIFF-like files
  * New option: "--padding" to control deep zoom of plain PNG/JPEG/TIFF images over IIIF
  * Added support for DICOM tag "Recommended Absent Pixel CIELab" (0048,0015)
  * Force version of Mirador to 3.3.0
  * In the IIIF manifest, reverse the order of the "sizes" field, which
    seems to fix compatibility with Mirador v4.0.0-alpha