CORBA26 — IFR backward compatibility broken

Moving existing interfaces from the CORBA module to a new IR module breaks
backward compatibility. Hence they should be moved back to the CORBA module. The
elements that are newly added can go into a new module, and interfaces
corresponding to the existing ones with the same names can be placed in the new
module, with these interfaces deriving from the existing corresponding
interfaces in the CORBA module, thus allowing all CORBA3 IR interfaces to be
accessed from a single module.

This also fixes a related problem regarding separation of the TypeCode stuff,
specifically TypeCode factory. It is broken in the current spec because certain
types used by the typecode factory were inadvertently moved to the IR module.

see below