Simplify new INDEX/NOINDEX language, order and panel order

Just say "Default" rather than "Like other pages in this namespace" (let's
put that in the help string/tooltip at some point); order the "default"
value between "yes" and "no" (like for TOC); make sure the panel for the
advanced settings is in the same position in the page menu as the meta-
data dialog.

Follow-up to I30d483b5b6c3df7e

Change-Id: I902eb4f8504866b2dcde32333cf365a59716c2ce