month-view: Show weather reports.

This commit triggers two existing issues:
 1. window size calculation
    (this breaks month-cells)
 2. wrong reference counts in views
    (I use :destroy to avoid dangling pointers)

src/views/gcal-month-view.h

@@ -21,6 +21,7 @@
 #define __GCAL_MONTH_VIEW_H__
 
 #include "gcal-manager.h"
+#include "gcal-weather-service.h"
 
 G_BEGIN_DECLS
 
@@ -34,6 +35,11 @@ void                 gcal_month_view_set_first_weekday           (GcalMonthView
 void                 gcal_month_view_set_use_24h_format          (GcalMonthView      *self,
                                                                   gboolean            use_24h);
 
+void                 gcal_month_view_set_weather_service         (GcalMonthView      *self,
+                                                                  GcalWeatherService *service);
+
+GcalWeatherService*  gcal_month_view_get_weather_service         (GcalMonthView      *self);
+
 G_END_DECLS
 
 #endif /* __GCAL_MONTH_VIEW_H__ */