0025418: Debug output to be limited to OCC development environment

Macros ending on "DEB" are replaced by OCCT_DEBUG across OCCT code; new macros described in documentation.
Macros starting with DEB are changed to start with "OCCT_DEBUG_".
Some code cleaned.

src/StepToGeom/StepToGeom_MakeBSplineCurve.pxx

@@ -76,7 +76,7 @@
     {
       if (i == 1)       aFMulDiff = aCurrentVal - Deg - 1;
       if (i == NbKnots) aLMulDiff = aCurrentVal - Deg - 1;
-#ifdef STEPTOGEOM_DEB
+#ifdef OCCT_DEBUG
       cout << "\nWrong multiplicity " << aCurrentVal <<  " on " << i 
            << " knot!" << "\nChanged to " << Deg + 1 << endl;
 #endif

src/StepToGeom/StepToGeom_MakeBSplineSurface.cxx

@@ -157,12 +157,6 @@ Standard_Boolean StepToGeom_MakeBSplineSurface::Convert
 	   ((SumMult - UMult.Value(1))== NUPoles)) {
     shouldBeUPeriodic = Standard_True;
   }
-  /*else {  // --- What is that ??? ---
-    shouldBeUPeriodic = Standard_False;
-#ifdef DEBUG
-    cout << "Strange BSpline Surface Descriptor" << endl;
-#endif
-  }*/
   
   // --- V Periodic ? ---
   
@@ -180,12 +174,6 @@ Standard_Boolean StepToGeom_MakeBSplineSurface::Convert
 	   ((SumMult - VMult.Value(1)) == NVPoles)) {
     shouldBeVPeriodic = Standard_True;
   }
-  /*else {  // --- What is that ??? ---
-    shouldBeVPeriodic = Standard_False;
-#ifdef DEBUG
-    cout << "Strange BSpline Surface Descriptor" << endl;
-#endif
-  }*/
   
   if (SS->IsKind(STANDARD_TYPE(StepGeom_BSplineSurfaceWithKnotsAndRationalBSplineSurface))) {
     const Handle(TColStd_HArray2OfReal)& aWeight = BSR->WeightsData();

src/StepToGeom/StepToGeom_MakeSurface.cxx

@@ -125,7 +125,7 @@ Standard_Boolean StepToGeom_MakeSurface::Convert (const Handle(StepGeom_Surface)
   }
   catch(Standard_Failure) {
 //   ShapeTool_DB ?
-#ifdef STEPTOGEOM_DEB //:s5
+#ifdef OCCT_DEBUG //:s5
     cout<<"Warning: StepToGeom_MakeSurface: Exception:"; 
     Standard_Failure::Caught()->Print(cout); cout << endl;
 #endif