implement support for multiple obs docs

[demorest]

implement support for multiple obs docs

[demorest]

Ok, I added stopTime to ScanConfig, and code to Controller so that stopTime gets filled in when the next Obs doc comes in.

I was thinking that the simplest way to deal with processing where stopTime is needed would be to add an option so that the Controller.handle_config() is not called until the stop time is known; this will generally be right at the start of the scan. Does that sound like it will work to you?

[caseyjlaw]

That makes sense to me. How about defining is_complete to consider whether the start and stop times are known? The controller could then check that before starting handle_config.
Since we're already at the point where "complete" is defined for multiple docs, we might as well define it for xml+vci+obs+obs, which is when a scan is completely defined.

[demorest]

Ok, this is implemented and pushed to my branch. I'm still testing a bit, will close this when I think things are working OK, unless you have any other suggestions.

[demorest]

I think this is basically working. We need to think a little bit about how to handle the special "finish" scans that come at the end of an SB. I'll open a new issue about this.