create a solve function for project
Merge branch 'master' of https://github.com/ipese/osmose
Merge branch 'master' of https://github.com/ipese/osmose
when operating cost is not defined for a periode, it looks in preceding periode
diferentiate Utility and Process for Fmin and Fmax definition in Unit
Merge branch 'master' of https://github.com/ipese/osmose