Issue1080 ROM soil temperature and interzonal heat exchange

[PGorzalka]

Finally, I was able to finish the work on issue #1080
@DaJansenGit & @FWuellhorst thanks for your support!

Changes mainly encompass the work mentioned in this paper:

• building up on changes already implemented via IBPSA merge, some adaptations for non-constant soil temperature
  • Option selector added to AixLib.BoundaryConditions
  • Options added to ZoneBaseRecord
  • Replaced TSoil constant in ThermalZone by option selector
• Interzonal heat exchange with new FiveElements RC model
  • Integration of that model into ThermalZone
  • Interzonal connection of zones in Multizone. For OM compatibility, I had to add an additional NzSplitter model and parameters to make sure arrays are initialized without errors.
  • Added ASHRAE test case 960

Additional minor stuff:

• made some parts of the ThermalZone model replaceable, so boundary conditions can be adapted more easily
• two missing eachs in AixLib.Fluid.Pools.BaseClasses.AirFlowMoistureToROM caused OM to fail -> fixed

Missing:

• Test Case 960 was not actually tested against standard results because the weather file provided (AixLib\Resources\weatherdata\ASHRAE140.mos) does not contain the weather data provided by the standard.

See also PR 785 in TEASER

Looking forward to your feedback on the changes!

[FWuellhorst]

@PGorzalka , nice, thanks for adding this nice feature to AixLib! We have an extensive CI which does a lot of groundwork of the review, but it only runs for internal branches. Thus, I added an internal branch based on your fork. Now, we see if naming guidelines and regression tests all run. Depending on the changes, you either can work in your fork and merge your fork into the internal branch, or we could add you as a developer so you can work directly in AixLib @DaJansenGit ?

[DaJansenGit]

@PGorzalka thanks for contributing!
@FWuellhorst Lets see what the CI outputs. If there are bigger changes that need to be addressed, I would add Philip as developer. Thanks for creating the CI branch!