Address of SymPy-Function `address_of`

Stephan Seitzrequested to merge
seitz/pystencils:address_of-function into master

Some CUDA functions (like atomic_add) require pointers to data. This PR adds a SymPy function representing the C address-of operator (&).

I tried to trigger cse to show a problem related to this function (dummy variables were not typed correctly as pointer). I'll include the fix in a follow-up PR.

Edited by Stephan Seitz

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