Add "display scale" to mesh warper source/destination mesh panels #1121
Description
Reported by Willi Koller.
When working with meshes on different size scales, it's difficult to reorient/use the linked cameras. The "prescale" options do make it possible/easier to work on different size scales, and unlinking the cameras does make it possible to look at the meshes, but it would also be useful to just scale the entire view (mesh+landmarks) by some factor for display purposes so that the linked cameras, zooming, etc. still work fine.