handle dead blocks at beginning of linked list
store block nr in block instead of maintaining extra variable
TODOs
obtain iterators more efficiently
reduce virtual array capacity from start of linked list
bench for 2 cpus as well
To get an idea how well the pareto task storage scales
ref: rename property
calculate virtual array capacity correctly
DOC
REVERTME: debug code
reduce calls to PLTSItem.is_taken_or_dead()
PLTSBlock may create dead blocks