Enh/axes

Vasilis Karlaftisrequested to merge
enh/axes into master
  • Added NIFTI_MRS loader
  • Updated code to use the Axes object where possible.
  • Added widget to toggle between Frequency and PPM x-axis in MRS View.
  • 'Load MRSI data' tool now automatically loads all datafiles defined in the FileTree, independent of key name.
  • Bumped dependencies.

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