Natural Support for NChoosek with min_count>0

[dlinzner-bcs]

There has been ongoing discussion in the past to allow for min_count>0 in NChoosekConstraints. There are currently two ways to achieve this: 1) Impose an additional mixture constraint 2) Model NChoosek via categorical variables #145 .

In interaction with users we realized that a more natural support would be helpful as it would require less assistance from our side. What is the best way forward to implement this feature?

[dlinzner-bcs]

@rosonaeldred @WaStCo

[rosonaeldred]

i don't see a quick way to add related tickets, related to #341