This dependency makes it harder to see the structure of the program,
and sometimes complicates compilation.
Mostly just changing the source of strings that are already exported
from the report package. A few new strings have to be moved there,
plus the function `IsPauseImageName()`.
and add a comment indicating non-memoisation of other, not shared
top-level renderers.
This memoisation is effective when the browser requests multiple
topologies for the same report.
