Recreate indexes when calling transform when possible and raise an er…#634

simonw merged 5 commits intosimonw:mainsimonw/sqlite-utils:mainfrom

matdmiller:fix_index_being_dropped_but_not_recreated_on_altermatdmiller/sqlite-utils:fix_index_being_dropped_but_not_recreated_on_alterCopy head branch name to clipboard