Fix not needed dropdown table-responsive overflow

This PR give a fix for not needed overflow on table-responsive with twitter bootsrap `3.3.*`.

It's related to #2582.

Batch action form, export, pager and page links are now on `list_footer` block instead of `table_block` because this is now outside the table.

Please feel free to review and comment this PR to fix and/or improve it! :+1: 

Thanks.