generate_cross_reference rendered the same relation twice in one
function, once per platform and once per upstream, and reached
complexity 53. Each view is now its own function and the caller is a
pair of calls.
Verified by generating the site with both versions against the same
data: all 533 pages identical apart from timestamps, with a control run
of the same code twice to confirm the comparison had no drift in it.
Abdessamad Derraz
ae7256f56f