Establish storage for calculated product footprints

[tmillross]

Priority: Low;
Estimated person-hours: 5
Volunteer(s)/Candidate(s): None

Functional specifications: Although product footprints may be produced on the fly from the the Direct Requirements Matrix, the calculated footprints may need to be stored (temporarily) to allow more speedy access.
Technical specifications: Provide a store for calculated product footprints in a form that makes them quickly accessible for web-queries, e.g. as csv files.

Relates to #10, copied from here with minimal editing for quality.

[MicDr]

The volunteer is not valid any longer.
I'd keep links to definitions in glossary to facilitate understanding of concepts, e.g. the Direct Requirement Tables

[tmillross]

Thanks @MicDr, it's updated now