Properly encode paths in simple-directory-handler

The original simple-directory-handler would only html-encode paths to
files.  This is obviously completely bogus; the path strings need to
get everything except slashes encoded.

Without this change, paths containing spaces or brackets of any kind
would result in links which caused the server to reject the request,
because the resulting URI would be invalid.  Browsers aren't always
smart enough to properly encode all special characters (which makes
sense, because they shouldn't mess with URIs, but they sometimes do,
which means we never really noticed this).

Also get rid of those ugly [] parenthesis synonyms and update
copyright year.

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