+ Added Page#tag_pages.
+ Added Page#series_page.
- Replaced tag_list with tag_pages. Design bug made while coding stupid.
+ Added TagDetail::all and made instances register themselves automatically.
+ Added SeriesPage::all and made instances register themselves automatically.
+ Removed TagDetail::generate in favor of plain new/initialize.
+ Removed SeriesPage::generate in farvor of plain new/initialize.
+ Added Site#html_page_map(&mapfn) to return a list of pages from mapfn.
+ Added Site#link_list(&mapfn) to return a list of html links from mapfn.

[git-p4: depot-paths = "//src/ZenWeb/dev/": change = 9866]