Flagger: change default isFlagged comparator to '>='
The current default comparator ">" for flagger.isFlagged returns False for the following call:
flagger.setFlags(field, flag=flagger.BAD).isFlagged(field, flag=flagger.BAD).any()
That seems to be somewhat counter intuitive to me.
This merge request adresses this issue by replacing the default comparator with '>='.