Improved/universal scenario difference file

[bsteubing]

Background

At this moment the AB knows 2 files for modeling scenarios:

• the scenario difference file (SDF): scenario definition at the elementary and intermediate flow level (exchanges)
• the parameter-scenarios file: scenario definition at the level of parameters

Idea

• to come up with a single file that can deal with scenario values for: exchanges, parameters, and characterization factors
• an additional column would specify what the values refer to (exchange, parameter, characterization factor)
• order would matter (like in the current files)
• a "None" or "Default" keyword could be used to skip an item in a specific scenario (but careful, this requires resetting the value to the one in the original database as the value in memory may have already been modified from that)

To think about

• does it technically work to evaluate parameters in between setting exchange values? Probably yes. But this may mean that exchange values already defined previously will be overwritten (again order of execution matters)