* the RPC-ECHO pipe now works in smbd, as long as the data sizes

 * the RPC-ECHO pipe now works in smbd, as long as the data sizes
   don't cause fragmented pdus (I'll add fragments shortly)

 * change data_blob_talloc() to not zero memory when the 2nd argument
   is NULL. The zeroing just masks bugs, and can't even allow a DOS
   attack

 * modified pidl to ensure that [ref] arguments to the out side of
   functions are allocated when parsing the in side. This allows rpc
   backends to assume that [ref] variables are all setup. Doesn't work
   correctly for [ref] arrays yet

 * changed DLIST_ADD_END() to take the type instead of a tmp
   variable. This means you don't need to declare a silly tmp variable in
   the caller
(This used to be commit 46e0a358198eeb9af1907ee2a29025d3ab23b6d1)