Hello, FPC developers' list

This is my first compiler patch. So please be indulge.

I tried to implement support for delphi sealed and abstract classes. They are described a bit here: http://edn.embarcadero.com/article/34324

At moment 'class abstract' in delphi do nothing although it should not allow to call a contructor of such a class. I have found QC report regards this but anyway parser supports them. Sealed class is a class which can't be derived by another class. This one is fully supported by delphi.

Using attached to this report http://bugs.freepascal.org/view.php?id=14824 patch I achieved the same behavior by fpc. But as I wrote - it is my first patch and I know nothing about compiler developement rules. Please review and comment if something is wrong.

Best regards,
Paul Ishenin.
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