- Update to version 3.4.0
* Major internal restructuring
* New formats: Hamamatsu NDPI, Sakura SVSLIDE, Ventana BIF (preliminary)
* Add openslide_detect_vendor()
* Deprecate openslide_can_open() (not very useful and often misused)
* Document performance considerations for openslide_open()
* Add properties giving the bounds of the non-empty region of the slide
* leica: Support multiple main images if their levels are coplanar
* leica: Use slide size as level size
* mirax: Support PNG- and BMP-formatted slides
* mirax: Fix "Expected first 0 value" error opening some slides
* mirax: Fix incorrect tile placement on some slides without overlaps
* mirax: Never synthesize downsampled levels
* Add OPENSLIDE_DEBUG environment variable (OPENSLIDE_DEBUG=? for help)
* Fix some crashes in error paths
* Add tests for many error paths