Ubuntu dependency editing UI is fairly useless

[William Grant]

r7374 adds a UI to IArchive/+edit-dependencies to select pockets to be in the ogre-model-generated sources.list. Unfortunately, it's not entirely useful.

The wording is dodgy: 'Security dependencies'? 'Backports dependencies'? What? 'Tested updates'? Backports are tested to an extent.

It's also impossible to use for some SRUs, as -proposed isn't enablable separately from -backports.

Congratulations, you have managed to design a UI with one more widget than is necessary for a rather more flexible and understandable UI. What would be wrong with checkboxes for (updates|security|backports|proposed)? People could be allowed to shoot themselves in the foot by enabling updates and not security, or validation could be performed somewhere. It's easy to fix in either case.

[Celso Providelo (cprov)]

Thanks for reporting this problem quickly, Willian.

There is a problem with the last option label, -proposed doesn't include -backports.

Additionally we can work on the labels in a way they match the terminology already used in the desktop application (see `software-properties-gtk` 'Updates' tab).

[Celso Providelo (cprov)]

RF 7388