Integrate the omtcursors into the BRT. So far only DB_NEXT is implemented....

Integrate the omtcursors into the BRT.  So far only DB_NEXT is implemented. Addresses #855, #856.  Added missing information needed for commit

git-svn-id: file:///svn/tokudb@4326 c7de825b-a66e-492c-adef-691d508d4ae1

src/range_tree/log_nooverlap.c

@@ -18,6 +18,7 @@
 #include <stdlib.h>
 #include <stdint.h>
 #include <string.h>
+typedef toku_range *OMTVALUE;
 #include "../../newbrt/omt.h"
 
 struct __toku_range_tree_local {