Making KDocTools independent of KArchive

[Stephen Kelly]

KDocTools depends on KArchive so that it can write cache files. Those files 
are currently written as .bz2 files, which is why KArchive is needed.

However, I can see no reason why qCompress and qUncompress would not do the 
job just as well. Porting to those would make KDocTools a tier1 framework. 
Any reason not to do that?

Thanks,

Steve.