Dwipreproc: Averaging of b=0 volumes

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I tried to use the -rpe_header and -se_epi option as you suggested, but got an error saying no phase-encoding contrast present in SE-EPI images which is not what you suggested would happen.

Sorry, I failed to include one important detail: This only works if you also specify the -align_seepi option (relevant code). The requirement & operation of this option is described in this blog post.

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