Split off candidate-6.4.x

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>

version.cmake

@@ -6,6 +6,6 @@ set ( HPCC_MAJOR 6 )
 
 set ( HPCC_MINOR 4 )
 set ( HPCC_POINT 1 )
-set ( HPCC_MATURITY "closedown" )
+set ( HPCC_MATURITY "documentation" )
 set ( HPCC_SEQUENCE 0 )
 ###