Added DREAM B1+ figures

[evaalonsoortiz]

• DREAM fmap (flip angle maps) are now registered to the MP2RAGE scan
• Spinal cord segmentation and vertebral levels are now warped to DREAM fmap scans
• The DREAM fmap is converted to a B1+ efficiency map using the same code that is used for the TFL flip angle map. I am not sure that this is correct, will consult with others.
• DREAM B1+ efficiency is plotted along the cord. A plot of the standard deviation along the cord is also generated.

Note: Once the DREAM scans acquired at different reference voltages are BIDS-formatted I will process the set of DREAM scans appropriately.

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