Add Delete operation in GridAccount

Fix a bug : Forgot to update stats when there is a modification

src/controller/KissCount.cpp

@@ -467,6 +467,10 @@ void KissCount::GetMonthStats(int month, int year, int nbDays,
     _db->GetMonthStats(_user, month, year, nbDays, operations, categories);
 }
 
+void KissCount::UpdateStats()
+{
+    _wxUI->UpdateStats();
+}
 
 std::map<int, double>* KissCount::GetNotChecked(int month, int year)
 {