RLS — Tbl130,Tbl136) The 'setData' method in InStream class

Tbl130,Tbl136) The 'setData' method in InStream class may be used for 'PUSH' type data passing. However, it is quite common that input side streams can not process all the data received. In such case, some flow control mechanism is required. Such mechanism is required for practical use. This should be defined in the specification, not depending on the middleware's ability of flow control.

Flow controls for ‘getData’ and ‘setData’ methods in RoLo streams originally
assumed that flow control will be done by the underlying middleware. However,
as pointed out in the summary, it will lead to middleware dependency which is
not what we want. Thus, here we prepare some methods for controlling the flow.
We add three methods, ‘activate’, ‘deactivate’ and ‘isActivated’ to OutStream
class.