added 'order by' option to set_relation_n_n

[GavinOB]

I added an optional "order by" parameter to the set_relation_n_n function. This allows sorting of the items in the multiselect list based on another field in the selection table.

[Pimnr47]

Hi Gavin,

Thanks for your contribution.

Isn't the point of the priority parameter such that the user can order the selected items themselves?

I think it makes more sense to only use it for unselected items. What would otherwise be the behaviour of the priority parameter?

Cheers, Pim

[ajuser]

It doesn't work in version 1.6.3. Can you help me?

Thanks