change nr dimensions to 5
DOC
compare priority values only in strategy
Remove old todos
REF
all accesses to items now with relaxed memory order
FMT
slightly more efficient shrinking
remove superfluous check
avoid superfluous instantiation of VirtualArrayIterator
clean up VirtualArray
REF: replace do-while by more readable while
REF: rename top->peek
REF: split up complicated loop condition

in preperation for more efficient handling of dead items
DOC
slightly mroe efficient handling of dead items
REF: remove superfluous variables
REF: simply return the iterator to the dead partition when we decrease it
minor simplification by removing superfluous if
REF for readability