0031004: Coding - eliminate warnings issued by gcc 9.1.0

Fixed -Wrestrict warning within OSD::SetSignal().

Fixed -Wdeprecated-copy warning by adding missing counterpart
in pair copy constructor / assignment operator or by removing trivial constructor.

AdvApp2Var_Node, AdvApp2Var_Patch are now declared as Handle.
AdvApp2Var_Iso is now passed by Handle.

Disabled operator= for TDF_Transaction and TDF_IDFilter.

Standard.cxx - fixed GCC version mischeck causing building failure with experimental GCC versions.

TopOpeBRepDS_EXPORT.cxx - fixed -Wmaybe-uninitialized warnings.

src/NCollection/NCollection_Array1.hxx

@@ -88,14 +88,6 @@ public:
       myPtrEnd = const_cast<TheItemType*> (&theArray.Last() + 1);
     }
 
-    //! Assignment
-    Iterator& operator= (const Iterator& theOther)
-    {
-      myPtrCur = theOther.myPtrCur;
-      myPtrEnd = theOther.myPtrEnd;
-      return *this;
-    }
-
     //! Check end
     Standard_Boolean More (void) const
     { return myPtrCur < myPtrEnd; }