Implement cpp anticirculant projector/constraint and add it in matfaust and pyfaust.

src/algorithm/constraint/faust_ConstraintGeneric.h

src/algorithm/constraint/faust_ConstraintGeneric.hpp

src/algorithm/constraint/faust_ConstraintMat.hpp

src/algorithm/constraint/faust_prox_gen.h

src/algorithm/constraint/faust_prox_gen.hpp

src/faust_linear_operator/CPU/faust_prox.h

src/faust_linear_operator/CPU/faust_prox.hpp

src/faust_linear_operator/GPU2/faust_prox_gpu.h

src/faust_linear_operator/GPU2/faust_prox_gpu.hpp

...tlab/+matfaust/+factparams/@ConstraintMat/ConstraintMat.m

...ab/+matfaust/+factparams/@ConstraintName/ConstraintName.m

wrapper/matlab/+matfaust/+proj/@anticirc/anticirc.m

wrapper/matlab/doc/mexFaustCplx.m

wrapper/matlab/doc/mexFaustReal.m

wrapper/matlab/src/faust_mex_prox.hpp

wrapper/python/pyfaust/factparams.py

wrapper/python/pyfaust/proj.py

wrapper/python/src/FaustFact.hpp