CLEANUP: remove most references to (deprecated) .ftr file format

- use .obj files for debugging purposes instead.

applications/utilities/surface/surfaceCheck/surfaceCheck.C

@@ -616,7 +616,7 @@ int main(int argc, char *argv[])
                 surfFileNameBase.lessExt()
               + "_"
               + name(zone)
-              + ".ftr"
+              + ".obj"
             );
 
             Info<< "writing part " << zone << " size " << subSurf.size()

applications/utilities/surface/surfaceMeshTriangulate/surfaceMeshTriangulate.C

@@ -142,7 +142,7 @@ int main(int argc, char *argv[])
     else
     {
         // Write local surface
-        fileName localPath = runTime.path()/runTime.caseName() + ".ftr";
+        fileName localPath = runTime.path()/runTime.caseName() + ".obj";
 
         Pout<< "Writing local surface to " << localPath << endl;
 

applications/utilities/surface/surfaceSplitNonManifolds/surfaceSplitNonManifolds.C

@@ -545,9 +545,9 @@ void calcPointVecs
 
             if (face0I == -1 && face1I == -1)
             {
-                Info<< "Writing surface to errorSurf.ftr" << endl;
+                Info<< "Writing surface to errorSurf.obj" << endl;
 
-                surf.write("errorSurf.ftr");
+                surf.write("errorSurf.obj");
 
                 FatalErrorIn("calcPointVecs(..)")
                     << "Cannot find two faces using border edge " << edgeI
@@ -557,7 +557,7 @@ void calcPointVecs
                     << " face1I:" << face1I << nl
                     << "faceToEdge:" << faceToEdge << nl
                     << "faceToPoint:" << faceToPoint
-                    << "Written surface to errorSurf.ftr"
+                    << "Written surface to errorSurf.obj"
                     << abort(FatalError);
             }