Fix failed connect

There is no such things as a clicked signal on QWidget. You activate
new UAS from right-click menu.
Fix failed connect

showLabel was connected to signal but not set as a slot
Fix failed connection

MainWindow::loadDataView has been commented out for 9 months now.
Removed commented out code instead of leaving cruft in.
Commented out uneeded debugging output
Remove qDebug statements
Merge pull request #566 from DonLakeFlyer/MoreConnect

More failed QObject::connect calls