Disambiguate gp_Pnt constructor when copying a Select3D_Pnt instance
Disambiguate gp_Pnt constructor when copying a Select3D_Pnt instance

BCC reports an error
  [C++ Error] Select3D_SensitiveSegment.cpp(207): E2015 Ambiguity between
              'gp_Pnt::gp_Pnt(const gp_Pnt &)' and 'gp_Pnt::gp_Pnt(const gp_XYZ &)'
because Select3D_Pnt has both gp_Pnt and gp_XYZ operators, and gp_Pnt takes both as
constructor arguments.

BenoitPerrot/oce,BenoitPerrot/oce,mathstuf/oce,tpaviot/oce,tpaviot/oce,Tridify/oce,finetjul/oce,EvgeneOskin/oce,finetjul/oce,mathstuf/oce,Tridify/oce,tpaviot/oce,tpaviot/oce,heartvalve/oce,BenoitPerrot/oce,Tech-XCorp/oce,heartvalve/oce,finetjul/oce,Tridify/oce,EvgeneOskin/oce,Tridify/oce,Tech-XCorp/oce,mathstuf/oce,finetjul/oce,heartvalve/oce,EvgeneOskin/oce,EvgeneOskin/oce,heartvalve/oce,Tech-XCorp/oce,Tech-XCorp/oce,BenoitPerrot/oce,mathstuf/oce,Tech-XCorp/oce,tpaviot/oce,mathstuf/oce,heartvalve/oce,EvgeneOskin/oce,finetjul/oce,BenoitPerrot/oce,Tridify/oce