Removed invalid packet: install
Updated wxWidget from 2 to 3
Do not exit if yum group install fails, because it also fails if all packages are installed already
Add check for correct wxGTK version report by wx-config. If incorrect cmake fails. Compare https://bugzilla.redhat.com/show_bug.cgi?id=1077718
Update the kicad-install.sh script to work with Fedora 20.