Weight&Balance modules must be refactored

[aidanjungo]

Module Concerned

Those modules shared some common functions.

• WeightConventional
• WeightUnconventional
• BalanceConventional
• BalanceUncventional
• Range

Task to do

• Simplify code when possible
• Rename variable to make them more explicit
• Use common functions an classes
• Save results in the Working directory
• If Create a report automatically #148 has been done, add these module to the automatic reporting
• Add unit tests
• Add integration tests
• Add README.md file for each module
• Add test cases with these modules
• Check that modules works in workflow (also with Optim and DoE)