symbolic permission for `all'

[Karl Berry]

It would be nice if there was a symbolic permission meaning `all
modes'.  Say `a', for the sake of argument.  It would useful
in a command like  chmod ug+rw,o-a  to take away all permissions from
`other'.  o-rwxst, besides being verbose, feels like there might be some
other kind of permission in the future or on some other system.

Another way to achieve the same result would be to allow numeric modes,
at least after =, as in chmod ug+rw,o=0 (which gets `invalid mode
string').

Just a thought ...

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