add status to the default lister fields

Since we now have status on allocations, e.g. purged, it makes sense to
show this by default.

lib/perl/Genome/Disk/Command/Allocation/List.pm

@@ -12,7 +12,7 @@ class Genome::Disk::Command::Allocation::List {
             is_constant => 1, 
             value => 'Genome::Disk::Allocation' 
         },
-        show => { default_value => 'id,absolute_path,kilobytes_requested,owner_class_name,owner_id,creation_time,reallocation_time' },
+        show => { default_value => 'id,status,absolute_path,kilobytes_requested,owner_class_name,owner_id,creation_time,reallocation_time' },
     ],
     doc => 'lists Genome::Disk::Allocation objects',
 };