Introduce 08-network

[ahao27]

Description

Introduces 08-network. Running ommx_create.py right under 08_network/models/integer_lp creates .ommx files.

Other Info

For now, The ommx files is not in this PR due to the size isuue. The instances is including in the ommx_create.py due to it is only a 24x24 matrix.

[Copilot]

Pull Request Overview

This PR introduces the 08-network directory containing network optimization models and their solutions. The purpose is to add a new set of optimization problems focused on network flow problems with 13-14 node networks.

• Adds solution files for network optimization problems with 13 and 14 nodes
• Provides optimal solutions with decision variable values and objective function values
• Includes flow variables (f#) and connection variables (x#) for network configurations

Reviewed Changes

Copilot reviewed 16 out of 26 changed files in this pull request and generated no comments.

File	Description
08_network/solutions/network14.bst.sol	Solution file for 14-node network problem with objective value 350173
08_network/solutions/network13.bst.sol	Solution file for 13-node network problem with objective value 304116

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[ksk-jij]

I've put some comments. Please have a look. Also, again, this time, I didn't execute any fils since my machine was busy. Please make sure it works well :)

[ksk-jij]

Looks good to me!