Incorrect comparison with included date

[mitch10593]

In this example, the backup done on 21/10/2016 should be kept, but it was removed:

2016-10-31 07:35:13 - NOTICE: checking date 20161022
2016-10-31 07:35:13 - NOTICE: match rule: daily after 2016-10-21: keep
2016-10-31 07:35:13 - NOTICE: checking date 20161021
2016-10-31 07:35:13 - NOTICE: match rule: daily after 2016-10-21: remove
2016-10-31 07:35:13 - DEBUG: /bin/rm -rf /backup/history/20161021

the daily rule is the default rule:
"daily": {
"day_of_week": "",
"day": "",
"month": "*",
"delay": "10 days"
}