Change allowed_statuses to status_blacklist

[rijkvanzanten]

Is your feature request related to a problem? Please describe.
We treat the management of fields on a blacklist bases; eg: when adding a fieldname to the column, it disables the field. However, statuses work the other way around. Adding a status name to the column activates it. This also means that by default all the statuses are disabled.

Describe the solution you'd like
Instead of calling it allowed_statuses (and thus making it opt-in), name it status_blacklist (in line with read_field_blacklist and write_field_blacklist and make it opt-out.

Describe alternatives you've considered
The alternative would be to add all the fields on create of new rows, but this seems like an extra (unnecessary) hassle.

@benhaynes thoughts?

[benhaynes]

Very good point, I agree. 💯