Fix 'approuve' button, add warning when break is not between day start and day end

sources/models/day.cpp

@@ -84,6 +84,20 @@ QJsonObject Day::to_json()
     return obj;
 }
 
+bool Day::has_warning()
+{
+  bool warning = false;
+  foreach (BreakPoint val, breaks) {
+     if (val.getStart() < start) {
+         warning = true;
+     }
+     if (val.getEnd() > end) {
+         warning = true;
+     }
+  }
+  return warning;
+}
+
 Day* Day::from_json(QJsonObject obj)
 {
     Day *result = new Day();