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To handle the fact that --data-file-directories is supposed to be 1+ folders. Note that boost::program_ops already "reserves" the use of std::vector as reciever of values for multitoken options (i.e. those with more than one value). Thus, values recieving a list of tokens via command line should adhere to the multi-token rules, i.e. space separated values. End result is that --data-file-directories now accept multiple paths, white space separated, i.e. --data-file-directories <path1> <path2> And as it turns out, this is really a nicer way of writing stuff than using "," or ":" seperation of paths etc, so... Signed-off-by: Calle Wilund <calle@cloudius-systems.com>