Remove debug print functions for printing equivalence map from model.cpp.
Remove debug print functions for printing equivalence map from model.cpp.

hsorby/libcellml,MichaelClerx/libcellml,nickerso/libcellml,MichaelClerx/libcellml,cellml/libcellml,hsorby/libcellml,hsorby/libcellml,nickerso/libcellml,hsorby/libcellml,cellml/libcellml,cellml/libcellml,nickerso/libcellml,nickerso/libcellml,MichaelClerx/libcellml,cellml/libcellml