refs #6 Implements Vacancy#create_project_user? and Vacancy#calculate_accepted_candidatures_amount.
refs #6 Implements Vacancy#create_project_user? and Vacancy#calculate_accepted_candidatures_amount.

volontarian/voluntary_recruiting,volontariat/voluntary_recruiting,volontariat/voluntary_recruiting,volontarian/voluntary_recruiting,volontariat/voluntary_recruiting,volontarian/voluntary_recruiting