switch-tab sends inactive to bg tabs, so no need to try and send inactive in all tabs when focus out. no debug now. ready to 0.8pre1!!

kilobyte megabyte etc is 1000 and not 1024. we could use KiB MiB if we want for 1024. more http://en.wikipedia.org/wiki/Kibibyte

debug() instead of print for pre1 (final will have them removed, also make another check just in case