don't require gl2ps

Plugin/CutPlane.cpp

-// $Id: CutPlane.cpp,v 1.41 2004-12-28 17:24:25 geuzaine Exp $
+// $Id: CutPlane.cpp,v 1.42 2004-12-28 17:25:44 geuzaine Exp $
 //
 // Copyright (C) 1997-2004 C. Geuzaine, J.-F. Remacle
 //
@@ -63,7 +63,6 @@ void GMSH_CutPlanePlugin::draw()
   Post_View **vv = (Post_View **)List_Pointer_Test(CTX.post.list, num);
   if(!vv) return;
   glLineWidth(CTX.line_width);
-  gl2psLineWidth(CTX.line_width * CTX.print.eps_line_width_factor);
   Draw_PlaneInBoundingBox((*vv)->BBox[0], (*vv)->BBox[2], (*vv)->BBox[4],
 			  (*vv)->BBox[1], (*vv)->BBox[3], (*vv)->BBox[5],
 			  CutPlaneOptions_Number[0].def,

Plugin/CutSphere.cpp

-// $Id: CutSphere.cpp,v 1.38 2004-12-28 17:24:25 geuzaine Exp $
+// $Id: CutSphere.cpp,v 1.39 2004-12-28 17:25:44 geuzaine Exp $
 //
 // Copyright (C) 1997-2004 C. Geuzaine, J.-F. Remacle
 //
@@ -68,7 +68,6 @@ void GMSH_CutSpherePlugin::draw()
   glPushMatrix();
   glColor4ubv((GLubyte *) & CTX.color.fg);
   glLineWidth(CTX.line_width);
-  gl2psLineWidth(CTX.line_width * CTX.print.eps_line_width_factor);
   glTranslated(CutSphereOptions_Number[0].def,
 	       CutSphereOptions_Number[1].def,
 	       CutSphereOptions_Number[2].def);

Plugin/Probe.cpp

-// $Id: Probe.cpp,v 1.4 2004-12-28 17:24:25 geuzaine Exp $
+// $Id: Probe.cpp,v 1.5 2004-12-28 17:25:44 geuzaine Exp $
 //
 // Copyright (C) 1997-2004 C. Geuzaine, J.-F. Remacle
 //
@@ -67,7 +67,6 @@ void GMSH_ProbePlugin::draw()
   double z = ProbeOptions_Number[2].def;
   glColor4ubv((GLubyte *) & CTX.color.fg);
   glLineWidth(CTX.line_width);
-  gl2psLineWidth(CTX.line_width * CTX.print.eps_line_width_factor);
   if(x >= v->BBox[0] && x <= v->BBox[1] &&
      y >= v->BBox[2] && y <= v->BBox[3] &&
      z >= v->BBox[4] && z <= v->BBox[5]){