Optionally add spacing scenarios to Summary

[MurrayEfford]

Via checkbox as for simulations
Not sure this is a good idea - restrict to simulated scenarios?

[MurrayEfford]

'Save' option in 1.1 is a more complete solution. Perhaps still add optimal spacing, but have run out of rows on page, so will start to require scrolling to see all fields

[MurrayEfford]

'Rows on page' is not a major constraint now the user may select which fields to display (secrdesign 1.1). But need more thought before adding fields willy nilly.