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making AllocateAndSizeLabels method and TextMappers ivar protected instead of private, making AllocateAndSizeLabels virtual

1.) vtkTypeRevisionMacro is now used in all VTK classes in place of
    vtkTypeMacro.  It invokes the original vtkTypeMacro and then adds
    a protected CollectRevisions method for future use in serialization.
    A corresponding vtkCxxRevisionMacro has been added to every .cxx file
    to implement the CollectRevisions method for each class.  This will
    allow collection of every class revision at run time.  Any new VTK class
    should use vtkTypeRevisionMacro instead of vtkTypeMacro.  The .cxx
    implementation should then have the following line:
      vtkCxxRevisionMacro(vtkFoo, "$Revision: 1.1 $");
    CVS should insert the correct revision number when the class is commited.

2.) vtkTypeMacro now also adds a typedef called "Superclass" to refer to
    the superclass of any VTK class.  All PrintSelf methods have been
    updated to call their superclass's PrintSelf like this:
      this->Superclass::PrintSelf(os,indent);
    This should reduce the number of places that refer to a superclass
    by its actual name.

3.) The standard ::New() method implementation has been replaced with a
    macro.  Instead of an explicitly written implementation to try the
    object factory and then call the new operator, VTK classes should
    instead use the following macro unless they have a special New() method:
      vtkStandardNewMacro(vtkFoo);
    This will implement the New() method in the standard way.  The line
    should appear in the .cxx implementation file, not in the header.
    Using the macro will make it easier to change the standard
    implementation of the method.

Also removed tabs from many files.

ENH: All unimplemented copy constructors and assignment operators made private so that errors will show up at compile time instead of link time.  Since they are not implemented, they can never be called, so they should be private instead of protected.

A new CVS repository was created on 2001-04-26 to fork VTK during
transition to a new source tree layout.  The new repository was created
using server-side symlinks referencing files in the original repository
to preserve per-file history.  This commit was manufactured during
conversion from CVS to represent the fork as a branch.

updated to reflect change

     overriding ALL versions of an overloaded function.  These were addressed
     by filling in the rest of the API.  In some cases, a subclass was
     overriding and overloading a function (changing input parameter to a
     more specific type).  For these cases, we "hid" the original function
     in the private section of the subclass.  There was one internal API
     change.  SetInput/Output(i, vtkDataObject*) was changed to SetNthInput/Output(.)

rendering organization. The volume rendering changes aren't complete,
but it is functional. All RenderOpaqueGeometry, RenderTranslucentGeometry,
RenderOverlay and RenderIntoImage methods now return an int indicating
whether something was rendered or not. This is mostly complete - but
opaque and translucent geometry rendering always return 1 for actors.