Renamed registerBus.mo to RegisterBus.mo
Closes #448 (closed). Openmodelica could not open AixLib because AixLib/Systems/ModularAHU/BaseClasses/RegisterBus.mo was named in lower case instead of upper case.
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Closes #448 (closed). Openmodelica could not open AixLib because AixLib/Systems/ModularAHU/BaseClasses/RegisterBus.mo was named in lower case instead of upper case.