Optimization/fix to only pass the content of all blog posts at once to $formatter

This seems to some how fix a strange bug I have seen on my test setup, need to investigate more.

apps/blagh/app.rc

@@ -68,9 +68,11 @@ fn blagh_body {
 
     echo '<div style="text-align:right">(<a href="index.rss">RSS Feed</a>|<a href="index.atom">Atom Feed</a>)</div>'
 
+    { # XXX Not sure why this fixes issues with blog setup, probably bug in fltr_cache!
     for(p in `{get_post_list $blagh_root^$blagh_dirs}) {
         l=`{echo -n $p|sed 's!'$sitedir^'/?(.*)([0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9])(/[^/]+/)!\2 /\1\2\3!'}
         sed '1s!.*![&]('^$l(2)^') ('^$l(1)^')!' < $p/index.md 
+    }
     } | $formatter 
 }