GE B1 Map Scaling

[alexdaniel654]

Proposed changes

GE B1 maps are exported scaled by the flip angle. This PR adds a small function to rescale the maps to a percentage of nominal flip angle.

Checklists

• [x] I have read and followed the CONTRIBUTING document
• [x] This pull request is from and to the dev branch
• [x] I have added necessary documentation (if appropriate)
• [x] I have updated documentation which becomes obsolete after my changes (if appropriate)
• [x] Files added follow the repository structure (if appropriate)

[codecov[bot]]

Codecov Report

Merging #190 (b418088) into dev (d6893a6) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev     #190   +/-   ##
=======================================
  Coverage   97.94%   97.95%           
=======================================
  Files          39       41    +2     
  Lines        3510     3522   +12     
=======================================
+ Hits         3438     3450   +12     
  Misses         72       72           

Impacted Files	Coverage Δ
ukat/utils/__init__.py	100.00% <100.00%> (ø)
ukat/utils/ge.py	100.00% <100.00%> (ø)
ukat/utils/tests/__init__.py	100.00% <100.00%> (ø)
ukat/utils/tests/test_ge.py	100.00% <100.00%> (ø)

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