ENH: New --robustRange option

Paul McCarthyrequested to merge
paulmc/fsleyes:enh/robustrange into main

New --robustRange / -rr command-line flag, which instructs FSLeyes to use the output of fslstats -r for the initial display range of all volume overlays. This is a global option applied to all loaded volumes, e.g.:

fsleyes -rr img1 img2 img3

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