Added getSurveyForContent method to SurveyLogic.
Added getSurveyForContent method to SurveyLogic.

This method returns a Survey for a given content. The backreferenceproperty will not work because of inheritance.

--HG--
extra : rebase_source : 327a528950762bb0c26d10438bbd50989932fcbf

SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange,SRabbelier/Melange