Move ISO13790 to ReducedOrder.ISO13790

[mwetter]

@amaccarini to move ISO13790 to ReducedOrder.ISO13790

[amaccarini]

@mwetter, I think that when we discussed this issue during the meeting, we were looking into the package organization of the Buildings library, where the package ThermalZones has four sub-packages: Detailed, EnergyPlus_9_6_0, ISO13790, and ReducedOrder. With this structure, it makes sense to put ISO13790 and VDI6007 under the sub-package ReducedOrder.
However, the package ThermalZones of the IBPSA library has currently only two sub-packages: ISO13790 and ReducedOrder. Should we simply replace the name ReducedOrder with VDI6007 then? The alternative is to have ThermalZones with only one sub-package ReducedOrder and two sub-sub-packages ISO13790 and VID6007.

[mwetter]

@amaccarini : We should have in the IBPSA library the structure

  ThermalZones
    ReducedOrder
       ISO13790
       VDI6007

Then, Buildings and other libraries can put their own thermal zone models into the ThermalZones package, parallel to the ReducedOrder package (or they are free to put them into other packages as appropriate).

[amaccarini]

Sounds good. Thanks for the clarification, @mwetter.