Work to fix NB#66729: after moving selected messages to another folder,

Work to fix NB#66729: after moving selected messages to another folder,
selection should go to the next available message.
* src/modest-ui-actions.c:
        * Now we pass a MoveToHelper as argument for move_to_cb. This
          helper contains a row reference for the next row to be
          selected if move to is successful, and the information banner.
        * Added new method get_next_after_selected_headers, that
          obtains a row reference of the next row of the header view
          after the selected headers.
        * (move_to_cb). Now, if we get a row reference in move to
          helper, we select it after moving the messages.

pmo-trunk-r3432