Add 'fslview' displaySpace, and change orientation warnings behavior

Paul McCarthyrequested to merge
paulmc/fsleyes:fslview-compatible-displayspace into main

Contributed by Christopher G. Shwarz (Github PR)

  • New fslview displaySpace setting uses pixdim-flip, similar to fslview/fsl coordinate space behavior
  • Orientation labels are now displayed in all scenarios, except when displaySpace is set to 'scaledVoxel'
  • The location panel orientation warning may be suppressed with a new --hideOrientationWarnings command-line flag

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