Linear decision tree definition and formulations

[SamuelNgotho]

This doesn't appear to work for multiple inputs and outputs.

[bammari]

Hello,

Thanks for opening this issue. Please see PR#176. We are reviewing this PR and will support multiple outputs in the near future (likely on the next release).

Best,

Bashar Ammari

[SamuelNgotho]

I am trying to do some edits on lt_formulation....but there is a small bit I am not understanding. If I manage to make some changes, I will share them with you.