CLEANUP: tree-wide: use array_size_or_fail() in array size for allocations

CLEANUP: tree-wide: use array_size_or_fail() in array size for allocations

Instead of relying on malloc(n*size), we now pass array_size_or_fail(n,m)
so that it becomes possible to detect overflow. This is particularly
interesting for global settings that might be set large enough to cause
overflows on 32-bit systems for example, resulting in small values that
then cause trouble. Now the overflow will be detected at allocation time.
Around 25 locations were updated.