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/Bisector/Bisector_BisecAna.cxx

@@ -783,7 +783,7 @@ void Bisector_BisecAna::Perform(const Handle(Geom2d_Curve)& afirstcurve  ,
   }
 
   type = curve->DynamicType();
-#ifdef DEB
+#ifdef OCCT_DEBUG
   gp_Pnt2d Point(asecondpoint->Pnt2d());
 #else
   asecondpoint->Pnt2d();
@@ -915,7 +915,7 @@ void Bisector_BisecAna::Perform(const Handle(Geom2d_Curve)& afirstcurve  ,
     case 2 : {
       GccAna_LinPnt2dBisec Bisector(line,asecondpoint->Pnt2d());
       
-#ifdef DEB
+#ifdef OCCT_DEBUG
       gp_Vec2d V(line.Direction());
 #else
       line.Direction();

src/Bisector/Bisector_BisecPC.cxx

@@ -427,7 +427,7 @@ void Bisector_BisecPC::Values(const Standard_Real    U,
 //purpose  :
 //=============================================================================
 // Unused :
-#ifdef DEB_CUR
+#ifdef OCCT_DEBUG_CUR
 static Standard_Real Curvature (const Handle(Geom2d_Curve)& C,
 				      Standard_Real         U,
 				      Standard_Real         Tol)
@@ -488,7 +488,7 @@ Standard_Real Bisector_BisecPC::Distance (const Standard_Real U) const
   else {    
     Standard_Real A  = 0.5*SquareMagPPC/Prosca;
     Standard_Real Dist = A*A*NorNor;
-#ifdef DEB_CUR
+#ifdef OCCT_DEBUG_CUR
     //----------------------------------------
     // Test Curvature if the curve is concave.
     //----------------------------------------

src/Bisector/Bisector_Inter.cxx

@@ -332,7 +332,7 @@ void Bisector_Inter::NeighbourPerform(const Handle(Bisector_BisecCC)&  Bis1,
   // Change guiedline on Bis2.
   BisTemp      = Bis2->ChangeGuide();
   Guide        = Bis2->Curve(2);
-#ifdef DEB
+#ifdef OCCT_DEBUG
   gp_Pnt2d P2S = Bis2->ValueAndDist(D2.FirstParameter(),U1,UMax,Dist);
   gp_Pnt2d P2E = Bis2->ValueAndDist(D2.LastParameter() ,U1,UMin,Dist);
 #else