How should equality for a Map behave?

[jllanfranchi]

What I have implemented now I always knew might be problematic, so this is a TODO from the code that should be discussed among the group, and particularly after several users have now had some time using PISA 3.

See the __eq__ method of Map for current implementation of the logic: https://github.com/jllanfranchi/pisa/blob/cake/pisa/core/map.py#L1227