Export of selected table entries and associated files to a different database / spyglass install

[lfrank]

It seems possible (perhaps likely?) that different groups will have their own databases, but would like to be able to import a set of analyses / results from another group. This could be something like issue #861 but with a provision to transfer entries to a different database.

There are multiple complexities here, but if this were possible it might be that it would be really useful.