relationship-generator 1.1.0

Stepparents and households, both opt in. With them off, a call gives exactly the family it gave in 1.0.0.

• request.stepparents: the partners a parent took while the anchor was a child, as stepfather/stepmother members with partner_of and step_parent_of edges (family::stepparents()).
• request.home: who the anchor lives with at the reference date (family::home: alone, a couple, with children, single parent, with parents, three generations), drawn from the country's UN household figures.
• Siblings now sort stably, so twins keep the same order on every standard library.
• Fixes a gcc 14 build error on members named life.
• Same dependencies as 1.0.0: birth-generator 3.2.0, name-generator 4.5.0.