Add multiple initial configurations for the SSOFT/ssHG1G2 model

[JulienPeloton]

IMPORTANT: Please create an issue first before opening a Pull Request. Linked to issue(s): Closes #467

If this is a new release, did you issue the corresponding schema in fink-client?

n/a

What changes were proposed in this pull request?

Multiple initial conditions for the SSOFT.

• [x] compute 4 times the SSOFT using different initial conditions
• [ ] update schema

How was this patch tested?

Manually