Fix post processing:

1) xml escapes don't print newlines anymore
2) reversed the logic of is_flow_tag by checking against a set of block_tags instead of phrase_tags. that way, unknown tags are always considered as flow tags.


[SVN r34139]

tools/quickbook

@@ -1 +1 @@
-Subproject commit f6e3ed6123d5a85cf4cbb350105a550f645ad156
+Subproject commit 2d67d18740a902359a51e4f266be38c8e3e876f2