Add optional calls to fiberassignment about desisurvey

[sbailey]

Comment: We definitely want surveyinit and afternoonplan to output what list of tiles should be fiberassigned at the next opportunity, but we don't need those codes to actually invoke fiberassign automatically. I'm not even sure we want that. e.g. even if we move fiberassign from NERSC to KPNO and make it completely automated, I'd rather see that happen as a wrapper cronjob script (run afternoonplan then run fiberassign) instead of coupling the two such that afternoonplan itself has to know how to call fiberassign). Maybe this is just aesthetics, but it smells like an unnecessary coupling.

[schlafly]

This is deprecated as we plan to move to fiberassign-on-the-fly.