new signal connection syntax
fix actions in the package context menu (bnc#866038)

Use QAction::triggered because QAction::activated is from Qt3
and it stopped working in Qt5

Use the new signal syntax which is checked at compile time.
http://qt-project.org/doc/qt-5.0/qtdoc/qt5-intro.html#new-connection-syntax
overloads:
https://qt-project.org/doc/note_revisions/246/416/view
version + changes
Merge pull request #14 from mvidner/typed-signals

fix actions in the package context menu (bnc#866038)