Bugs in Finder

[hayalaso]

I was trying to test the algorithm in the IC 443. I found one bug in helpers.py where ppl is not defined.

When using the flags to plot the surface, I get that ax doesn't have a view_init() property

I also don't see the figures. Maybe they get clear before being shown

[pasoneko]

There's a few bugs with finder because of mismatched versions I think, I'm currently working on resolving them