New command check-collections

[odscjames]

#18

[odscjames]

@kindly , this builds on #18

As noted in #18 , "Checks and Transforms are currently run by the check-collection and transform-collection command. This is clunky as you have to run that command by hand, and you have to run it for each collection individually."

This adds a new check-collections command. The idea is this can be run from a cron entry - I won't say more on that here as hopefully the docs page I added is clear enough on that.

I'm not saying this is the final form a solution to #18 will take - we talked about message ques before - but this is a relatively simple fix that means people don't have to log in and run the 'check-collection' command by hand any more. That's:
A) A good "improving one step at a time" thing for us for now.
B) If we do do something with message ques later but someone else using the software doesn't want to install those, this is a ok solution they can use instead.

If your happy with this, I'll do something similar and make a "check-transforms" command too.

[kindly]

I am fairly happy about this.

I would like the advise to be clearer that we do not expect a check to take more than a minute so that it is safe to run a cron one minute after the time you set.

I think killing the process a minute after you specify, so it could be good to add something horrible like the below set 1 minute after the specified time.
https://stackoverflow.com/questions/20775624/end-python-code-after-60-seconds#answers-header
as that would give more assurance the the other job was definitely over.

[odscjames]

Yeah, I'm happy to update docs and add the killer thing