Option to append/interpose ivib code

[jschnet]

New users may not want to work with ivib, so having an option to trigger the append/interpose the ivib code could make life simpler in the long run.

• [x] Fix displayed message for appending ivib.
• [x] Asked multiple times.
• [x] Exits program on appending code from push_code button

[jschnet]

just fixing the option to append ivib code.