To push ahead with the refactoring,
I will build the test/diagnostics API completely anew,
and attach it solely to an instance of `DiagnosticBufferProvider`.
Unfortunately this ''leads us into chainsaw surgery...''
* it uncovers a host of conceptual contradictions
* actually, the `HeapMemProvider` was more an implementation
of diagnostic tracking, than it was an actual `BufferProvider`
implementation (hence the old name: `TrackingHeapBlockProivder`)
* and this lured me into using these tracking functions directly,
while the `DiagnosticBufferProvider` remained in unfinished state.
So basically I have now **disabled** all verification from the Unit-tests.
I'll have to rebuild them from scratch, thereby reproducing the logic/intention
Ichthyostega
e10aa751bb