Add an example for censoring and interpolating volumes in FMR data based on motion estimates

[ofgulban]

Requested by @ju-ec , initial script provided by @ju-ec . Items to consider:

• Plots the motion estimates (as saved by BV)
• Plot framewise displacement with respect to the PRT files (optional).
• Plot a carpet plot to identify problematic volumes in the data.
• Save an SDM file containing a predictor of spike volumes (*_FDspikes.sdm) as identified based on a FD threshold set by the user in the script.
• Censor FMR volumes based on *_FDspikes.sdm.
• Interpolate in place of the censored volumes using linear op spline interpolation.