Does it mean that updates will stop at v. 4.0?
No, "this project" is the internal code changes that consist of complete separation from GUI and Logical Parts (and some other internal structure changes).
I decide to perform this part in "steps". Actually i have worked on the Single Market (Ping-Pong Creator, Logs, Market Explorer, Gain etc....)
A question: what does it mean when a Ping has "Status: Death" in Ping orders and trades?
this happens when order is no more on the exchange BUT CAT doesn't find the TRADE that fills the order.
If the QTY Remaining is some satoshi it could be a rounding operation performed by the exchange on your order.