Actually working checks for writability

Now we scan the fonts only if we can write in the final file. There is
currently (if I understand correctly) no clean way to check if a folder
is writable or not in Lua: lfs.attributes will give you the string
returned by ls -l, but there is no simple way to know if we can actually
write, as we don't know if we are the owner, or if we have access to the
group...

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