Incremental XML parsing

[Zack Rusin]

The attached patch implements incremental XML parsing.

Also fixes a rather silly bug:
QString line;
for ( .... ) 
   QString line = result;
Now of course line is always empty which was the cause why the XML error 
page wasn't displaying the line that caused the parsing error before.

Zack

-- 
Warning: Dates in Calendar are closer than they appear.

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