Dropped unused indexes info
Added --namespace option to set the namespace of repacked tables

Bumped version number to enforce extension re-creation as the SQL has
been modified.

Current limitations:

- Check for namespace existence: on error temp objects are left around
- What happens to the indexes?
- Tests needed.
- Should the default be the GUC default_tablespace instead of pg_default?
  This is actually an original pg_repack shortcoming, not a regression.