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Let the testing interactor take care of the image comparisons when
appropriate. Currently has a hard coded tolerance of 40, which should
work for most of the chart tests.

vtkChartXY::AddPlot now calls vtkChartXY::SetPlotCorner

NO_BUTTON = 0
LEFT_BUTTON = 1
MIDDLE_BUTTON = 2
RIGHT_BUTTON = 4

This allows me to remove some boilerplate code, which still allowing
interactive use of the tests.

Thanks to Karthik for explaining the mouse interaction testing, and Bill
Lorensen for showing me the vtkTestingObjectFactory code. This is the
first VTK charts test with mouse interaction tests. It manipulates the
chart in several ways, and then records an image of the end result after
panning, zooming, selecting and panning.

At present, they cannot be used from any of the wrapped languages,
despite the wrapping being able to wrap them. If this changes, then I
will begin wrapping them again.

Several small changes to use the new scene API, fixed a potential memory
leak in the AddPlot function.

The vtkImageItem class had soem test code in it that shouldn't really
have made it into a release. Simplifying vtkImageItem seems like the
right way to go here, we can add back any missing features later.

Removed virtuals whose implementation in vtkChart is fine, added an
extra virtual to get rid of the compiler warning about
overloaded-virtuals. These two should likely be removed, and the
initialization of the class changed.

The base class (vtkChart) already implements the correct behavior.

Thanks to Robert Kerr for pointing out that the Python tests had some
semicolons lurking from their conversion to Python. Also removed a stray
tab character that had crept in.

Removed a test that did not do very much, renamed the parallel
coordinates test, fixed ordering in CMakeLists and only build the tests
requiring baseline images if VTKData is present.

Added support for rendering unicode text using the 2D API. Also added
two new tests, although the freetype version is disabled until freetype
correctly renders the unicode characters. Verified that the Qt version
works as expected.

Added some vtkUnicodeString overloads for rendering unicode strings to
the screen.

Added a check for comparison operators for const_reverse_iterator, use
the non-const form if not. This affects compilers/STL headers for GCC
versions less than 4.1 at least.

It does not always make sense to include the scene in places that need
the mouse event API, and so I have separated it out. This means that
classes can just use the mouse event data structure.

Thanks to Eric Monson for the suggested patch, setting the field and
content type - this should address the issues outlined in that report.

Removed pointless stored variables, and adapted to deal with the more
general case of axes assuming only perpendicular axes in x and y.

This should give better defaults when adding points plots, adjusting the
default back to what it was in line plots.

The clang frontend is stricter about the declaration of functions
before use, this should hopefully fix up the compilation errors reported
in the bug report.

Thanks to Eric Monson for the suggested patch, setting the field and
content type - this should address the issues outlined in that report.

Thanks to Eric E. Monson for the suggestion, and suggested patch. This
adds additional API to draw a scaled vtkImageData using vtkContext2D.