Passing the MorphableModel by const& in shape-fitting
Passing the MorphableModel by const& in shape-fitting

It doesn't make a real performance difference (since all matrices are smartpointers) but it's better practice.

icyrizard/eos,patrikhuber/eos,patrikhuber/eos,icyrizard/eos,icyrizard/eos,patrikhuber/eos