add removeSpmPrefix

Author: Remi-Gau

src/utils/removeSpmPrefix.m

@@ -0,0 +1,10 @@
+function image = removeSpmPrefix(image, prefix)
+  %
+  % (C) Copyright 2019 CPP ROI developers
+
+  basename = spm_file(image, 'basename');
+  tmp = spm_file(image, 'basename', basename(length(prefix) + 1:end));
+  movefile(image, tmp);
+  image = tmp;
+
+end