Deal with invalid docinfo details. Refs #1281.

Warn when boostbook attributes are used for docbook document types and
don't output them.

[SVN r62470]

tools/quickbook

@@ -1 +1 @@
-Subproject commit b363dedac40c58d45fc5feb8ab9576aaa4380490
+Subproject commit d61eb528cf16e3ca2698665283abe42ee7d6a811