Scheduler behavior with same target and new targets file

[wtgee]

Thorough documentation would probably take care of this but we could also need to clarify the behavior for some of the edge cases with the scheduler.

See comment: https://github.com/panoptes/POCS/pull/588/files#r219329388

Edit (Feb 2020): The issue is what should happen if someone changes the target configuration for a target that is currently taking observations. Should that go into effect immediately? If so does that start a new observation, etc.

[ImmortalRabbit]

Thorough documentation would probably take care of this but we could also need to clarify the behavior for some of the edge cases with the scheduler.

Could you give more explanation about this issue, I should add tests to check edge cases using scheduler or something else? if yes, what kind of edge cases could appear here?