Issue1505 rom initial conditions

[FWuellhorst]

This closes #1505 but builds upon #1500 and should be merged after that one.

Once merged, we have to create the same issue in TEASER and remove all usages of der_T(fixed=True) - should be easy and fast.

[ebc-aixlib-bot]

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[FWuellhorst]

@Jun-Jiang-92 Now that you know the PR workflow, do you want to do this review for me?
Besides adding the initial conditions based on the dynamics, I used the correct statement to redeclare the replaceable zoneParam record and corrected some docs.

[Jun-Jiang-92]

@FWuellhorst Thank you for the improvement. In addition to the in-line review, I have a few questions:

1. For the partial model,

   AixLib/AixLib/ThermalZones/ReducedOrder/ThermalZone/BaseClasses/PartialThermalZone.mo

   Line 5 in e834573

   replaceable parameter DataBase.ThermalZones.ZoneBaseRecord zoneParam

   
   since you already changed the redeclaration of zoneParam, should the prefix parameter here be removed?

2. In partial model, there are some instance without full path, e.g.
   

   AixLib/AixLib/ThermalZones/ReducedOrder/ThermalZone/BaseClasses/PartialThermalZone.mo

   Line 72 in e834573

   RC.FourElements ROM(

   
   will it better to complete them?

[FWuellhorst]

@Jun-Jiang-92 Thanks for your review! Regarding full path, I changed occurrences. Regarding the parameter, a replaceable class may still be a parameter to indicate it is not a model. For records, it is usual to declare it as replaceable parameter.

[Jun-Jiang-92]

Thank you for the explanation. The changes can be merged after CI-check.