CMakeLists.txt

Monitor DISPOSE events emitted just 'before' releasing the CDO
to count when consumers have got their copy of the CDO.
We don't use REQUIRE or DEMAND events because a consumer that starts
before the consumer will trigger these bfore the consumer has
attached an event monitor.

Using events for termination simplifies our mocktage workflow
and reduces the need for extra files to be written to signal
completion and allows counting of consumers fairly reliably.

Several debug tweaks and other info messages have been added