Need to check if program is install or install it

[kuhlkrein]

If a program is not install we should not display the button to open it or we could ask the user to install it

[kuhlkrein]

we could give an automatic way to install it

[kuhlkrein]

This issue is usefull only for "outside the iso" box implementation

[kuhlkrein]

fixed starting from #40 to around #62