Rename docs/kjs directory to docs/kjs5
Review Request #127933 - Created May 15, 2016 and submitted
rename directory + adapt CMakeLists.txt file
this change is necessary to fetch translated kioslave docs
without hacks either in frameworks release script or in autogen.sh
into the frameworks tarball.
See also https://git.reviewboard.kde.org/r/127904/ for a detailed explanation
Together with commiting this change I'll adapt Scripty.
builds and installs the kcm docs to the same installdir as before