Enumerated annotation types should sort the possible values

[Nicklas Nordborg]

This is typically not an issue to begin with since the order of the values are usually kept the same as when the annotation type was created. However, if the list of possible values are modified they seem to change their order in an unpredictable way which is annoying.

This affects all places were the list of values are displayed. For example, in the filter selection in list pages and in the edit dialogs.

It would be better if the values could always be returned in a predictable order (eg. sorted).

[Nicklas Nordborg]

In 7734:

Fixes #2188: Enumerated annotation types should sort the possible values