Reduce number of missing wiki links by setting ignore_missing_pages in TracIni

The GHC wiki currently has lots of missing links, which makes for harder reading.

A partial solution, from http://trac.edgewall.org/wiki/CamelCase:

"There's an option (ignore_missing_pages in the [wiki] section of TracIni) to simply ignore links to missing pages when the link is written using the CamelCase style, instead of that word being replaced by a gray link followed by a question mark."

Could this option be set for the GHC wiki?

Trac metadata

Trac field	Value
Version
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Trac & Git
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	hvr
Operating system
Architecture