[APBeta] External catalogue settings

[Paul Rodman]

Currently, the External Catalogues settings/preferences reside on a tab within the Field of View preferences. This is because the only place they are used (currently) is in the Field of View chart itself.

It would seem that this is confusing some folk, who expect those settings to be with the other catalogue settings in the Catalogue Manager window.

It would be a copy-and-paste job to change this. However, I'd be interested in getting feedback before I do.

Paul R.