and refactore this function for better readability

and refactoring this function for better readability

Not all sendNodes for communication after fine to coarse were found.
This was only a problem when cutting the domain in the z-direction.

pipeline #7663

Remove them from LevelGridBuilder

in Parameter.cpp

For communication after interpolation fine to coarse

when looking for the sendIndices for the communication after f to c

needed for new method which reorder send and receive indices