trfs - translate spaces and other runes in names in a file system
makes the contents of directory
appear on the directory
but every space character in file and directory names viewed through
is made visible as a special `no-break space' character (U+00A0).
Other Inferno applications will not mistake it for the end of a file name,
and it has some visible representation in most fonts.
There can be error or ambiguity if the existing tree also uses no-break space in its names.