Load bigtiff

See https://www.notion.so/qim-dtu/Load-BigTiff-5befc589dee3497d9c88a4977e113361

qim3d/io/load.py

@@ -66,10 +66,14 @@ class DataLoader:
                 If 'self.virtual_stack' is True, returns a numpy.memmap object.
 
         """
+        # Get the number of TIFF series (some BigTIFF have multiple series)
+        with tifffile.TiffFile(path) as tif:
+            series = len(tif.series)
+
         if self.virtual_stack:
             vol = tifffile.memmap(path)
         else:
-            vol = tifffile.imread(path)
+            vol = tifffile.imread(path, key=range(series) if series>1 else None)
 
         log.info("Loaded shape: %s", vol.shape)