a couple of focus/chance improvements when die turndown fails

* If you don't turn down focus dice far enough, retain the selected values so you can see them
* Make the text for this case a little friendlier
* Fixes #341
* Jenkins: http://jenkins.buttonweavers.com:8080/job/buttonmen-cgolubi1/108/
* Important: i pulled 208_retain_attack into this branch, so approve #477 before this one