Makefile.defs: version set to 5.6.6

src/Makefile.defs

@@ -106,7 +106,7 @@ INSTALL_FLAVOUR=$(FLAVOUR)
 # version number
 VERSION = 5
 PATCHLEVEL = 6
-SUBLEVEL =  5
+SUBLEVEL = 6
 EXTRAVERSION = 
 
 # memory manager switcher