Last part of the operation aimed to

• Normalize the file types of several compressed file types
• Remove duplicate code in krarc.cpp and krarchandler.cpp.

After the present changes: there isn't any compressed file type with a '/' as a first character. For more information anyone can see the proposed modifications and also:

• https://phabricator.kde.org/D1707
• https://phabricator.kde.org/T2768

Several operations (opening, extracting, and (when possible) deleting and adding) were performed with the new source code, using 28 different compressed files. Those operations left a trace (in /tmp/krdebug), that trace was the same (excluding some trivial changes like the numbers of the lines of the source code) than the trace obtained using the previous source code and the same operations.