Change VC and query names to lowercase (close #902)

Make VC and query names consistent by storing them in lowercase in the
database and cache.
Handle VC and query name incase-sensitivity in database access.
Handle referTo in VirtualCorpusRewrite

Change-Id: I7cb94e9b007b6a07fc8b9dd7dda4249318c6c3a5
diff --git a/Changes b/Changes
index 3e25a0e..2a90c92 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,6 @@
+# version 1.1-SNAPSHOT
+- Change VC and query names to lowercase
+
 # version 1.0.1
 
 - Add an exception for missing layer.