[ ] Spinner [ ] Improve add comic dialog [X] Add Language property to comics [X] Comic Manager [X] Properties comic dialog [X] Improve the comic loaging stuff [X] Remove Edit menu [X] Improve welcome and error messages [X] Save to disk the comics selected by the user [X] Cache system [X] Debug system [X] Disable Comic -> properties when no comic selected [X] Comic List: ellipsise [X] Save a comic as PNG [X] Move vfs errors from stdout to message_view [X] Disable save a copy menu item when loading comics [X] Update sensitive of previous and next buttons [X] When moving in a comic (first and last) [X] On an error (it should be possible to move back)