Find all send and recv indices which also are interface cells fine to coarse, coarse (iCellFCC).
Move them to the front of the vector of send and recv indices. Return their number as well.

(cherry picked from commit 3191433948c45d04b49729cc92e9b54796981a7f)

To avoid compiler errors, the destructor of Parameter must be defined in Parameter.cpp

also rename methods exchangePostCollDataGPU27() to exchangeCollDataGPU27()

prevents accidental use of the null stream

* move cudaEventRecord to UpdateGrid27
* use variables for stream indices in UpdateGrid27
* create and destroy streams in Simulation.init() and Simulation.free()

Previously, the event was also triggered when data was written. This behavior caused crashes of VF