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/AdvApp2Var/AdvApp2Var_Context.cxx

@@ -44,7 +44,7 @@ static Standard_Boolean lesparam(const Standard_Integer iordre,
   //  else if (*ndgjac < 61) { nbpnt = 61;} Bug Uneven number
   else {
     nbpnts = 50;
-#if ADVAPP2VAR_DEB
+#ifdef OCCT_DEBUG
     cout << "F(U, V) : Not enough points of discretization" << endl; 
 #endif
   }

src/AdvApp2Var/AdvApp2Var_Iso.cxx

@@ -163,7 +163,7 @@ void AdvApp2Var_Iso::MakeApprox(const AdvApp2Var_Context& Conditions,
     NDGJAC = Conditions.VJacDeg();
     NCFLIM = Conditions.VLimit();
     break;
-    //#ifndef DEB
+    //#ifndef OCCT_DEBUG
     //pkv f
   case GeomAbs_NoneIso:
     //pkv t
@@ -236,7 +236,7 @@ void AdvApp2Var_Iso::MakeApprox(const AdvApp2Var_Context& Conditions,
   Standard_Real *EMXAPP = new Standard_Real[NBSESP];
   Handle (TColStd_HArray2OfReal) HERRMOY  =  
     new TColStd_HArray2OfReal(1,NBSESP,1,IDERIV+1);
-  //#ifdef DEB
+  //#ifdef OCCT_DEBUG
   //Standard_Real *ERRMOY =
   //#endif
   //  (Standard_Real *) &HERRMOY->ChangeArray2()(HERRMOY ->LowerRow(),HERRMOY ->LowerCol());