[openbeos] struct stat st_mode bits

I was going through stat.h earlier, and I was wondering if anyone had 
any idea on what S_ALLOW_DUPS was supposed to be ?
doesn't seem to be used anywhere.
Maybe we could use that bit for something useful, like Hurd's 
S_INOCACHE.
(maybe a flag for open() would be more appropriate though.
cf.
http://sources.redhat.com/cgi-bin/cvsweb.cgi/libc/sysdeps/mach/hurd/
bits/stat.h?rev=1.6&content-type=text/x-cvsweb-markup&cvsroot=glibc

Also I'd reconsider using S_FOO_INDEX in favor of S_INDEX, since it's 
not very scalable... we have only 2 bits left in that field.

François.

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