[configs/alter] October update

* Set the default serial speed to 115200 bps, also add a new boot entry for this
* Restore the extra EFI support, except for the efiboot.img, which is used for "El Torito" EFI boot mode
* Use the emacs-friendly US keymap
* root-image: use ext4 instead of ext2
* New packages in packages.{backport,both}: pax, bmon, 6rdctl-git, autodkms, smp_utils, isz-tool and so on
* build.sh: add '--preserve=timestamps' to some cp command, in order to preserve the mtime
* Change the way to determine if enable NoCow(chattr +C) for btrfs pool
* Remove the empty fstab in root-image/etc
  ... and other minor fixup
[configs/alter] November update

* Add packages:
  * compton: good X11 compositor
  * hardening-wrapper: scripts for building hardened executables
  * picocom: _pico_ serial communication program
  * whowatch: watch who is doing what in real-time
  * hping
* Remove packages:
  * pax-utils
  * gpick
  * minicom - don't know how to use, takes up more space than picocom
  * optipng - zopflipng provides a better compression ratio
  * sxiv,feh - gpicview provides same functionality
  * xfce4-terminal - http://invisible-island.net/xterm/xterm.faq.html#bug_gnometerm
* Replace packages:
  * vim -> gvim - for GTK+ gui
  * syslog-ng -> rsyslog - for rsyslog's templates - to specify the format that a user want
* Other minor update:
  * vim,tmux,mc,zsh configuration
  * archiso_sys.cfg: reword - should be bps instead of baud, see http://www.tldp.org/HOWTO/Modem-HOWTO-23.html