readdirplus NFS mounts now the default

[Matthew Dillon]

    DragonFly NFS clients now default to a readdirplus mount, which
    greatly improves directory traversal performance (find, ls, tar,
    etc).  I had to make some fixes to the client-side readdirplus
    code as well and I'd appreciate it if people could do some testing.
    I'm particularly interesting in DFly<->Linux tests (for both client
    and server operation).

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>