Feature request: add capability to dither

[sybenzvi]

Hi there,

Last week @sbailey and I discussed adding a dithering feature to the specsim code. Currently the code (through desimodels) allows for specification of the position of the spot on the focal plane, but as far as I can tell it doesn't allow dithering around a source. So I'd like to add this, but before making any changes, a few questions:

1. I think desimodels is the place to make this addition. Am I right?
2. I do not see hooks in the existing code for dithering. Did I miss anything?
3. I'm willing to add the necessary hooks but don't want to collide with changes planned by @dkirkby; I'm told that some refactoring of the project is in the works.

So... if desimodels is the right place and someone else isn't planning to add something similar I'll add the dithering feature to a branch and submit a pull request.

[dkirkby]

This sounds like a straightforward feature to add in specsim, without requiring any changes to desimodel, so I suggest opening a specsim issue and we can discuss further there.

[sybenzvi]

Will do. Closing the issue here and moving it to specsim.