tweaked fork/revert buttons
turned off wait-cursor on diff/revert/fork dialogs - reset back to default destroys cursor settings (eg on buttons)
add wait cursor to enter/re-enter fork/revert and traffic-light and set back to previous cursor when wait finishes
add wait-cursor to diff-dialog << < > >> was_tag now_tag
added wait-cursor to fork/revert-dialog << < > >> tag
noted minor wait-cursor flaw in notes