ENH: object representation

[albop]

Displayed objects should have some information:

• HModel:
  • ...
• Equilibrium:
  • ...
• PerturbedEquilibrium:
  • ...

[NormannR]

This is how the HModel output looks like

Tell me if you think which specific information should be shown for the Equilibrium and PerturbedEquilibrium objects. After looking at the associated objects, I find no natural thing to display.

[albop]

it looks good to me for now. I'd say the model type should be 'hetag' as a codename for heterogenous agents, while we are looking for a better name

[albop]

can you submit a PR ?