bug: Fix copying of page assets during the bake. * The `Assetor` wasn't setting the "used assets" flag on the correct object. (I wonder why Python didn't complain about that) * The baker wasn't looking at the right input filename.

[pytest]
norecursedirs = .* _darcs CVS .svn .git .hg *.egg-info dist build node_modules venv tmp* {args}