After being burned by using `head -c6 /dev/urandom | base64` as part of a 
directory name, I realised that it would be useful if base64 had an option to 
generate URL and Filename safe encodings, as specified in RFC 3548 section 4.

This would make
cat FILE | base64 --filename-safe
equivalent to
cat FILE | base64 | tr '+/' '-_'
using the current coreutils tools.

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