A Separate bw_calc

[cmutel]

This is already quite advanced. Specific tasks:

• [ ] A1 Updating presamples or porting concept of campaigns to another library (or bw2data calculation setups) to allow easier management of datapackages
• [ ] A2 Provide equivalent of ComparativeMonteCarlo

Nice-to-have:

• [ ] A3 Standard report format for calculation results
• [ ] A4 Packaging/scripts (plus containerization) to easily get calculation running on web servers
• [ ] A5 Web API (e.g. Flask app) for running calculations, with rate-limited implementation on DdS server
• [ ] A6 Provide support and specification for multiple impact categories in one calculation (MultiLCA)