little fix for devhelp-caching

[David Nolden]

I downloaded devhelp-documentation for the GNU C Library, installed it in 
KDevelop, and the links from the documentation-index didn't work. The problem 
was that the html-pages were saved in a subfolder "book" under the location 
of the .devhelp-file. I moved the devhelp-file into that folder, but the 
cache of the old links was used and the links still didn't work. So I just 
wrote this little patch to use different cache-filenames for documentation 
stored in different locations.

If you like I can also make a patch for the devhelp-plugin to check for that 
subfolder "book" and use it if necessary.

greetz, David
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