Expand options for Trees "Order By Field" and allow granular selection in Preferences

[bronwyncombs]

Requested by Sorarya at Naturhistorisches Museum Bern (via speciforum):

We would like to sort the Chronostratigraphy tree chronologically, not alphabetically. It would be useful to have a field to assign sort order.

Currently, "Order By Field" options include: Name, Full Name, Rank ID, and Node Number.

Expanding this list to include a field like "Code" or another custom field would enable custom ordinal selection and satisfy their needs for chronological sorting.

Further, creating a chronological Chronostratigraphy tree is limited by the order by field preference applying to all trees.