Minor reorg of handler selection, move comment code to bridge app.

Bigger changes still to come.

apps/bridge/app.rc

@@ -0,0 +1,26 @@
+fn bridge_init {
+    if(! ~ $#allowComments 0 && ~ $REQUEST_METHOD POST) {
+        get_post_args comment_text
+        d=`{date -n} # FIXME Obvious race
+        d=$local_path.md_werc/comments/$d/
+
+        u=$logged_user
+        if(~ $#logged_user 0) {
+            get_post_args comment_user_name comment_user_password
+            # TODO Should take this path too if the user can login but doesn't
+            # belong to required group
+            if(! login_user $comment_user_name $comment_user_password) {
+                u=$comment_user_name ':' $comment_user_password
+                d=$d^'_pending'
+            }
+            if not
+                u = $logged_user
+        }
+
+        umask 002
+        mkdir -m 775 -p $d
+        echo $u > $d/user
+        echo $comment_text > $d/body
+    }
+
+}