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Changes from JpGraph 2.2
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Requested new features:
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CR#443 - Add support for russian LED characters
CR#431 - Make it possible to add an alternate text to linear barcodes
CR#427 - Feature request to add trademark symbol to SymChar class 
CR#433 - Make it possible to add images to tables without constrains
CR#450 - Add option to specify window target for CSIM

Reported Defect fixes:
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PR#430 - Wrong scope for protected variable in PHP5 version of PDF417
PR#432 - Unquoted % sign in error message 22001
PR#438 — v2.x does not handle line weight==0 properly
PR#441 - Wrong HTML for circle CSIM in v2.x
PR#442 - Fixed possible undefined sval for CSIM when no alt titles are given
PR#444 - Divide by zero in certain date scale ranges
PR#445 - Example code: Image::SetAntiAliasing() expects boolean
PR#250 - Off by one - rounding error for filled gradients
PR#448 - Workaround for bug imagefilledarc() (Affects Pie)
PR#449 - Adding text to rotated graphs gets wrong angle for box
PR#451 - Various code cleanup for 2.x branch (uninitialized instance variables etc.)

Additional code fixes:
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* Make minimum automatic margin smaller
* Added support for XPM image format
* Add error check to see if imageantialias() GD function exists before calling it
* Added flags for Bangladesh and Republic of Serbia
* Wrong unicode value for TM
* Corrected wrong error message and uninitialized variable
* Potential divide by zero case for tick positioning
* Removed deprecated call to AdjBackgroundImage() in Example
* Updated CSIM examples to not include the filename in the StrokeCSIM() call 
* Added Example combgraphex1.php to 2.x tree

