Revert "Issue a message if explicit vectorisation is off."
Revert "Issue a message if explicit vectorisation is off."

This reverts commit ceb818f213aadbf3863aa496fa1120abfb726729.

olifre/root,karies/root,karies/root,karies/root,olifre/root,olifre/root,karies/root,olifre/root,root-mirror/root,root-mirror/root,root-mirror/root,olifre/root,zzxuanyuan/root,karies/root,karies/root,olifre/root,zzxuanyuan/root,root-mirror/root,root-mirror/root,zzxuanyuan/root,olifre/root,root-mirror/root,root-mirror/root,zzxuanyuan/root,zzxuanyuan/root,karies/root,olifre/root,olifre/root,karies/root,root-mirror/root,root-mirror/root,zzxuanyuan/root,zzxuanyuan/root,zzxuanyuan/root,zzxuanyuan/root,karies/root,root-mirror/root,zzxuanyuan/root,root-mirror/root,karies/root,zzxuanyuan/root,zzxuanyuan/root,olifre/root,karies/root,olifre/root