relicense LGPLv2+

cullmann@altair:~/local/kate/kate/tests> ../../kde-dev-scripts/relicensecheck.pl codecompletiontestmodel.cpp

- lgplv2+: brauch michalhumpula
   brauch (  19 LOC): 7abaa315
michalhumpula (   1 LOC): 65bf9f52

=> got OK on kwrite-devel@kde.org

cullmann@altair:~/local/kate/kate/tests> ../../kde-dev-scripts/relicensecheck.pl wordcompletiontest.cpp

- lgplv2+: brauch michalhumpula
   brauch ( 112 LOC): af7860df
michalhumpula (   1 LOC): d2a778a6

=> same here

codecompletiontestmodels.cpp just wrapper for the .h, copied copyright from there