allow programs other than DARK, GRAY, BRIGHT about desisurvey

[dkirkby]

Thinking about this a bit more, the scheduler associates DARK/GRAY/BRIGHT with corresponding cuts on the sun & moon parameters, so these program names are effectively predefined in the code and used to ensure that a DARK tile is not observed when the moon is up, etc.

I can think of two possible SV scenarios that would require new program definitions:

• There are some SV tiles that should be scheduled independently of the moon (and sun?) parameters.
• There are some SV tiles that care about sun/moon params, but with different boundaries than the main survey.

Does either of these apply to SV? Otherwise, can someone describe the SV use case where you wouldn't want to label tiles using DARK/GRAY/BRIGHT?

[dkirkby]

Closing this with the "wontfix" label since the current desisurvey.tiles.Tiles assumptions should be sufficiently general to support SV. Please reopen with any new info.