Version 2.8.4

• The logic for reading FSL-FLIRT transforms from file previously overlooked a
  quirk whereby FLIRT flips images whose xforms have positive determinant (see,
  for example, https://neurostars.org/t/understanding-fsl-flirt-transformation-matrices/26406).
  This could result in a spurious flip when these transforms were applied, if the
  originally registered images were in, say, LAS and RAS orientations. This
  detail is now handled when FLIRT transforms are imported. (Reported by Martin
  Wilson.)
• Affine initialisation matrices for linear registration would previously be
  replaced by a default internally. This has been corrected.
• Default affine initialisation matrices now take the pixel/voxel dimensions into
  account when image sform and qform codes are both zero.
• The package's dependency on the ore package has been removed, with base R
  regular expression functions being used instead.