CORBA24 — Chunked GIOP marshalling for variable-length types

Summary: Following the discussion of valuetype chunking in the OBV group, I"ve
been thinking that the arguments advanced for it really apply to all
the other variable-length types in CORBA (sequences and strings) as
well as to OBV value types, and wonder if we might try a small change
to the marshalling rules.

Currently, we marshal a string (say) by sending the length of the
string followed by the bytes of the string. If we don"t know the
string"s length in advance, say because we are reading it from stdin
or a subprocess, we need to buffer it in memory and send it as one big
thing. That"s inefficient.

Close this previously deferred issue as too much for RTF. Add to GIOP future version "wish list" do