They redirect to https://wiki.sei.cmu.edu.
Fix broken links for open rules.
Remove broken links from closed rules.
Remove links in Java rules for CERT C rules with no obvious replacement.
Expand broken tinyurl to CERT.
When an include is not surrounded by empty lines, its content is inlined
on the same line as the adjacent content. That can lead to broken tags
and other display issues.
This PR fixes all such includes and introduces a validation step that
forbids introducing the same problem again.
