linux-pax-flags: compare file flags, more verbosity

Signed-off-by: David Sterba <dave@jikos.cz>
linux-pax-flags: add force option to unconditionally overwrite flags

Signed-off-by: David Sterba <dave@jikos.cz>
linux-pax-flags: print a note when configured file is a symlink

Signed-off-by: David Sterba <dave@jikos.cz>
linux-pax-flags: print summary before action

Signed-off-by: David Sterba <dave@jikos.cz>