added 2011 year to the copyright line
added authors info to the license
added UofM license to libtirpc files that we modified
(but i probably missed some)
acls are lists of arbitrary length, so xdr_array() is used to allocate the array
during decode. because this memory is allocated by the tirpc library, it needs
to be freed there as well; added function nfsacl41_free() to do this with XDR_F
REE
Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>