Extending KZip class

[Θεόφιλος Ιντζόγλου]

I'm trying to improve the karchive plugin of ark to have better support for 
zip files but unfortunately there are some things missing from the KZip class 
like support for encrypted archives and file deletion. Should I create patches 
for the KZip/KArchive classes or just subclass KZip class and do all the 
necessary changes locally?

Theofilos Intzoglou
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