Add retina display support to the default Info.plist.

Task-number: QBS-529

Change-Id: I77c5db7f0e3516ac3022468a2c242ffcf5441401
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Make fuzzy test more thorough.

"Successful" incremental builds can also be an error, if a clean build
fails for the same project.

Change-Id: I9f52d840fbda53a906c039e1ee0db2c656db6f8e
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>