Add possibility to block update of latest repository (- to be discussed -)

[mcm1957]

Once an adapter is accepted for latest repository every new release published at npm is immidiatly accepted to latest.

I would suggest to add some blocking mechanism to (temporary) suspend this mechanism for adapters.

Currently an adapter violating important rules (i.e. missing bluefox access) or missing minimal github tests etc. cannot be suspended. Its only possible to remove the adapter from latets all together - which might be too destructive to current users. If update could be suspended this will add an additional reminder to dev to fix the problems.

Blocking could be done by either adding a new attribute to sources-dist.json or be inventing a new list.

to be discussed