Added missing include in test_canonicalview.cxx
Added missing include in test_canonicalview.cxx

`#include <ctime>` needed for time(0) in test_canonicalview.cxx
plstcharles/opengm,joergkappes/opengm,DerThorsten/opengm,opengm/opengm,DerThorsten/opengm,opengm/opengm,DerThorsten/opengm,plstcharles/opengm,chaubold/opengm,plstcharles/opengm,plstcharles/opengm,opengm/opengm,joergkappes/opengm,joergkappes/opengm,opengm/opengm,joergkappes/opengm,DerThorsten/opengm,joergkappes/opengm,chaubold/opengm,opengm/opengm,plstcharles/opengm,chaubold/opengm,DerThorsten/opengm,chaubold/opengm,chaubold/opengm