show payment status in user view; Fixes #965

src/model/user/member.rs

@@ -41,4 +41,14 @@ impl Member {
             _ => false,
         }
     }
+    pub(crate) fn supposed_to_pay(&self) -> bool {
+        match self {
+            Member::Schnupperant(_)
+            | Member::Scheckbuch(_)
+            | Member::Regular(_)
+            | Member::Foerdernd(_)
+            | Member::Unterstuetzend(_) => true,
+            _ => false,
+        }
+    }
 }