---- 1.6.22 2012/10/10
+--- 1.6.22 2012/10/11
Requires YAZ-4.2.40 to support native solr support.
detect this based on same query and limits and partly sort order.
This could lead to segementations violations.
+Added a chapter in the manaul about relevance ranking.
+
--- 1.6.21 2012/09/24
Rank tweak: follow=number will increase mult by number if two terms