coupled processes.

Updated the data pointer

First application of the staggered scheme: coupled thermal hydraulic processes

minor changes according to Dima's comments.

 properties of liquid flow process

of Heat process to another file.

This fixes a CMake configuration error.

[CMake] Moved external project downloads to Azure storage.

[Bug] Set return 0. for not drho/dT in LinearTemperatureDependentDensity

Used http protocoll for downloading as some CMake installation may
not have curl with https support.

Small fixes

warning: expression with side effects will be evaluated despite being used as an operand to 'typeid' [-Wpotentially-evaluated-expression]