Add seed argument to C++ randFaust and bind it into pyfaust.rand.

src/faust_linear_operator/CPU/faust_TransformHelper.h

src/faust_linear_operator/CPU/faust_TransformHelper.hpp

src/faust_linear_operator/GPU2/faust_TransformHelper_gpu.h

src/faust_linear_operator/GPU2/faust_TransformHelper_gpu.hpp

wrapper/python/pyfaust.py

wrapper/python/src/FaustCoreCpp.h

wrapper/python/src/FaustCoreCpp.hpp

wrapper/python/src/FaustCoreGenCy.pxd.in

wrapper/python/src/_FaustAlgoGenProc.pyx.in