[IMP] tools: added a regex for bounce email addresses
[MERGE] Sync with trunk
[MERGE] Sync with trunk
[MERGE] Sync with trunk
[MERGE] Sync with trunk
[IMP] orm: first draft of improvign group_by on date field, allowing to tune the grain, format and interval when grouping on a date field. Default behavior is the old one, grouping on month.
[MERGE] Sync with trunk
[MERGE] Sync wsith trunk
[MERGE] Sync with trunk
[DOC] read_group: added comments for the new formatting option
[IMP] read_group: added forgottent year computation
[IMP] read_group: group_by -> groupby (same variable, but was used in previous implementation, so I keep it)
[MERGE] [IMP] tools: added a regex for bounce email addresses

[IMP] read_group: added possibility to customize the group_by on datetime fields. A special context key can be used for datetime fields : datetime_format.
context[datetime_format] = {
    'field_name': {
        groupby_format: format for to_char (default: yyyy-mm)
        display_format: format for displaying the value in the result (default: MMM yyyy)
        interval: day, month or year; used for begin and end date of group_by
                  intervals computation (default: month)
    }
}