Remove excessive built-in page options

Right now we have built-in abilities to specify whether the "Subscription" pages show up as a tab or as a menu callback and what the title of the page should be. I think this may be overly specific customization, considering you can't actually change the paths of these items (they're always at user/x/subscription). If we can't change the URL, we shouldn't both with changing the page title. All of the adjustments can be done with hook_menu_alter() of course, which is probably the way we should handle all such customization.

This patch just removes these options.