reinstate call to cahce_seq_ids_with_mult_assemblys as this has now been fixed

modules/Bio/EnsEMBL/AssemblyMapper.pm

@@ -97,7 +97,7 @@ sub new {
 
   $self->adaptor($adaptor);
 
-  #$adaptor->cache_seq_ids_with_mult_assemblys();
+  $adaptor->cache_seq_ids_with_mult_assemblys();
 
   if(@coord_systems != 2) {
     throw('Can only map between 2 coordinate systems. ' .

modules/Bio/EnsEMBL/ChainedAssemblyMapper.pm

@@ -111,7 +111,7 @@ sub new {
           scalar(@coord_systems) . ' were provided');
   }
 
-  #$adaptor->cache_seq_ids_with_mult_assemblys();
+  $adaptor->cache_seq_ids_with_mult_assemblys();
 
   # Set the component, intermediate and assembled coordinate systems
   $self->{'first_cs'}   = $coord_systems[0];