Add new Page methods including: $page->hasChildren(), which works exactly the same as $page->numChildren() except that it returns only number of visible children. I've never quite liked $page->numVisibleChildren or $page->numChildren(true) from the API perspective, so $page->hasChildren() is something I'm happier with. Though the old methods/properties will continue to work too. This commit also includes a new $page->editUrl (or $page->editURL if you prefer) property that returns the URL to the page editor for the current page.