Provide an easy way to generate additional pages

[hegemonic]

Right now, if you create a Baseline child template, there's not a super-easy way to tell Baseline that you want to generate entirely new pages that aren't in the base template. There should be a super-easy way to do this.

[hegemonic]

This will be tricky (if not infeasible), because we need some way for the new page to indicate what data it needs. We also need to know how many times to call the template (once per longname? just once? etc.).