Work to fix bug NB#81989:

Work to fix bug NB#81989:
* src/modest-ui-actions.[ch]:
        * Now send receive operations get an interactive parameter. This
          is used to know if the action was scheduled pressing any UI
          send receive action.
        * If a send queue operation has errors, and last operation done
          on it was an interactive send receive, we show the errors. If
          not, errors do not show feedback.
* src/dbus_api/modest-dbus-callback.c:
        * Set as non interactive send receive operations requested from
          dbus.
* src/maemo/modest-main-window.c:
        * Set as interactive send receive mail operations requested from
          toolbar button.
* src/modest-mail-operation.[ch]:
        * Set "send mail" operations as non interactive to disable
          error feedback.
        * Propagate and set properly the interactive values for send
          receive operations.
* src/modest-tny-send-queue.[ch]:
        * Add an internal attribute to set if last request to send queue
          was an interactive send receive.
* src/modest-tny-account-store.c:
        * Send receive scheduled by a connection status change is a
          non interactive send receive.

pmo-trunk-r4299