Make the RepeatFeature feature collection use STRAIGHT_JOIN since the

RepeatFeature adaptor uses it.  Don't seem to make a difference to
timing results though.

modules/Bio/EnsEMBL/Collection/RepeatFeature.pm

@@ -7,6 +7,16 @@ use warnings;
 
 use base qw( Bio::EnsEMBL::Collection );
 
+#-----------------------------------------------------------------------
+# Specialized protected methods from base class
+# Bio::EnsEMBL::DBSQL::BaseAdaptor
+#-----------------------------------------------------------------------
+
+sub _straight_join {
+  # Makes no difference? The RepeatFeature adaptor has it...
+  return 1;
+}
+
 #-----------------------------------------------------------------------
 # Specialized protected methods from base class Bio::EnsEMBL::Collection
 #-----------------------------------------------------------------------