[IMP] support grouping by hour

odoo/models.py

@@ -1695,6 +1695,7 @@ class BaseModel(MetaModel('DummyModel', (object,), {'_register': False})):
                 # Mixing both formats, e.g. 'MMM YYYY' would yield wrong results,
                 # such as 2006-01-01 being formatted as "January 2005" in some locales.
                 # Cfr: http://babel.pocoo.org/docs/dates/#date-fields
+                'hour': 'hh:00 dd MMM',
                 'day': 'dd MMM yyyy', # yyyy = normal year
                 'week': "'W'w YYYY",  # w YYYY = ISO week-year
                 'month': 'MMMM yyyy',
@@ -1702,6 +1703,7 @@ class BaseModel(MetaModel('DummyModel', (object,), {'_register': False})):
                 'year': 'yyyy',
             }
             time_intervals = {
+                'hour': dateutil.relativedelta.relativedelta(hours=1),
                 'day': dateutil.relativedelta.relativedelta(days=1),
                 'week': datetime.timedelta(days=7),
                 'month': dateutil.relativedelta.relativedelta(months=1),