Just a first draft. Not mapping python frames to struct btp_frame, but
using a shortcut and mapping directly to struct backtrace_entry.
Note: After reading the code I think there are several memory leaks
(especially struct backtrace_entry is never free'd - or am I missing
I've pushed the wizard changes from Denys into a branch called
new-wizard, so I can do some changes on top of it. I also going to push
the changes in the main UI into a branch called new-wizard.