go(plot): use createPath instead of createFolder

..as it's more universal, should we start/allow passing more complex
paths than "./res-folder".. should e.g. "./res/subpath" be passed to the
former func, it would error out more easily, as the subpath would likely
be non-existent, akin to `mkdir <path>` vs `mkdir -p <path>`.

algo/plot.go

@@ -59,7 +59,7 @@ func plotAllDims(allStats []stats.Stats, fPrefix, fExt string) {
 				log.Fatal(err)
 			}
 
-			if err := createFolder(picPath); err != nil {
+			if err := createPath(picPath); err != nil {
 				log.Println(err)
 			}