Patch for 68523

[Allan Sandfeld Jensen]

Hi

I have a possible patch for bug 68523 
<http://bugs.kde.org/show_bug.cgi?id=68523>, and would like to have it 
reviewed.

Basically the crash happens when a subcall of the htmltokenizer::executeScript 
ends up deleting the tokenizer itself. This can create crashes several 
different places. 

This patch adds a function isExecutingScript which docimpl.cpp will check 
before deleting the tokenizer. As far as I can see, the tokenizer will still 
be deleted later by the nofityFinished()-call, but otherwise it just needs an 
extra function that hints it should delete itself after it is done executing 
scripts.

The patch is attached.

`Allan
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