import IB's TWS API 9.69-5 (969.03)

This is still converted to the old directory layout
update ChangeLog-IB to 9.69 final
revert cpp API downgrade ...

Looks like IB's 969.03 relase was broken. Java and CPP CLIENT_VERSION are not
in sync. So we guess here how it should be correct ... but we are not in sync
with upstream right now.