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intensity is off (first sample on ray), but use an arbitrary threshold for
when blend by intensity is on, to cut through haze. A bit hacky, but seems to
work well. GL21 only

open, the context will have changed, and contents of 3d canvas frame buffer no
longer available. But we can take advantage of the fact that GLVolumes are
actually rendered to an off-screen texture.

blendByIntensity is disabled, but need to play with approaches for when it is
enabled (to cut through haze).

RF: Sample along line tool supports 2D and multi-channel images

See merge request fsl/fsleyes/fsleyes!292

just taking mean intensity for latter)

RF: Change/improve XNAT browser

See merge request fsl/fsleyes/fsleyes!291

  - no longer modal, and stays open after files are downloaded, i.e. stays
    open until user closes dialog window.
  - Download button disabled unless files are highlighted
  - "Save full XNAT paths" option to save files into a directory hierarchy
    that mirrors the XNAT project hierarchy

BF: Use 'pixdim' affine for scaled voxel display space, not 'pixdim-flip', as the latter will potentially L/R flip some images

See merge request fsl/fsleyes/fsleyes!289

the latter will potentially L/R flip some images

MNT: dev version bump

See merge request fsl/fsleyes/fsleyes!287

Scale line vector colours in addition to lengths

See merge request fsl/fsleyes/fsleyes!285

not drop the first entry. GLRGBVolume adjusts texture coordinates for 2D
images.

suppression

vector length, so the shader is passed colour-scaled data, and lenghtScale
option is used to correct the vector length

vertex shader. This is so that colours can be scaled too. Not quite correct yet.

with length 0 or NaN values.

Display all images in scaled voxels

See merge request fsl/fsleyes/fsleyes!286