COW cleanup patch (1583966):

1. perform deep comparison for the classes for which it makes sense in the
   ports where this wasn't done yet
2. remove (shallow) comparison operators for the classes for which it does
   not make sense (such as wxBitmap)
3. makes wxBitmap use COW on all ports
4. adds wxObject::IsRefTo()
5. centralizes and improves COW docs


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42752 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/accel.tex

@@ -85,6 +85,12 @@ initial accelerator table for a window.
 
 <wx/accel.h>
 
+\wxheading{Predefined objects}
+
+Objects:
+
+{\bf wxNullAcceleratorTable}
+
 \wxheading{Example}
 
 {\small%
@@ -150,6 +156,7 @@ and cmd values like you would construct wxAcceleratorEntry objects with.}
 \func{}{\destruct{wxAcceleratorTable}}{\void}
 
 Destroys the wxAcceleratorTable object.
+See \helpref{reference-counted object destruction}{refcountdestruct} for more info.
 
 \membersection{wxAcceleratorTable::IsOk}\label{wxacceleratortableisok}
 
@@ -170,35 +177,3 @@ Assignment operator, using \helpref{reference counting}{trefcount}.
 \wxheading{Return value}
 
 Returns reference to this object.
-
-\membersection{wxAcceleratorTable::operator $==$}\label{wxacceleratortableequal}
-
-\func{bool}{operator $==$}{\param{const wxAcceleratorTable\& }{accel}}
-
-Equality operator. This operator tests whether the internal data pointers are
-equal (a fast test).
-
-\wxheading{Parameters}
-
-\docparam{accel}{Accelerator table to compare with}
-
-\wxheading{Return value}
-
-Returns true if the accelerator tables were effectively equal, false otherwise.
-
-\membersection{wxAcceleratorTable::operator $!=$}\label{wxacceleratortablenotequal}
-
-\func{bool}{operator $!=$}{\param{const wxAcceleratorTable\& }{accel}}
-
-Inequality operator. This operator tests whether the internal data pointers are
-unequal (a fast test).
-
-\wxheading{Parameters}
-
-\docparam{accel}{Accelerator table to compare with}
-
-\wxheading{Return value}
-
-Returns true if the accelerator tables were unequal, false otherwise.
-
-