Hi,

We're almost ready to merge a massive change set to opm-output, and a highlight 
from that change set is that the new Summary support is switched on. As with 
all new development we, unfortunately so, have to prepare for bugs and quirks. 
Sorry about that.

With the apologies out of the way, here's a quick list of known issues or 
uncertainties.

# Nonsensical values
We're still a bit in limbo when it comes to handling obviously nonsensical 
values. An example:
Well W1 is a producer, but WWIR water injection rate for all wells is 
requested. Should we:
* Print 0 (i.e. no injection)
* Print the negative injection (i.e. production) for the well? If the well 
produces at the rate 2.3, then -2.3 would be printed
* Print a default "undefined" constant?

# Approximately zero
How do we handle values that are essentially zero? The current reference 
summary file does not print 1.29967e-18 for the water injection rate a timestep 
for Norne, but the simulator reports this. This can be numerical noise and it 
can be a tiny rate. What about 1.56839e-09? For reference, these numbers are 
given as-is by the simulator and read from the simulator's own state, so it's 
the numbers the simulator works with.

# Known issues and limitations
* Accumulation resets don't work properly yet.
* Only well- and group keywords are supported, and the list is still fairly 
short

There's likely to be other bugs as well. That being said, the data now written 
is configurable and plentiful compared to what we had, so I still consider this 
an improvement. It might be rough in the transition period, but hopefully with 
more users we'll see rapid improvements.

Happy squashing!


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