inline: Do not generated feeds for nested inlines.

inline: Do not generated feeds for nested inlines.

My experience is that when inlines are nested, the old behavior of
generating feeds for the nested inlines was never really desired. Since the
feeds were numbered sequentially, the numbers could easily change, and it did
not make sense to subscribe to or use those feeds. And generating those nested
feeds often meant a lot of unnecessary calculation, and data being written.
So, I dropped them.

Looking back, nested feeds originally were a free side effect of properly
handing multiple feeds on one page. Of course, that is still supported.