Notably
* have tools and helpers in a SurveyCase and let SurveyCommon bet the
one with data;
* remove unnecessary with_user, replaced by standard one;
* move all tools in SurveyCase to help reusing them;
Notably
* have tools and helpers in a SurveyCase and let SurveyCommon bet the
one with data;
* remove unnecessary with_user, replaced by standard one;
* move all tools in SurveyCase to help reusing them;