0.4.0

Features

• A new multi solver interface is introduced, we no longer use OR-tools
• The user can choose different solvers
• in case of unfeaseable problems, the program now prints a console and file outputs
• Benders console information are now also printed on a specific file
• solver traces can be activated by specific option in benders/bendersmpi console applications

Bug fixes

• remove erroneus value from the "problem_status" entry of the output json file
• fix display of overall cost of the best solutions