[#18] Add xz-utils package where tar is extracted

In case when there is fresh linux installation, `tar -xf` might not work
correctly - without `xz-utils` package. That's why following command:
`sudo apt-get install xz-utils` has been added to script files that
execute `tar -xf` command.

setup-dillo.sh

@@ -3,6 +3,7 @@
 # Install DILLO
 
 # Get dependencies
+sudo apt-get install zx-utils
 mkdir -p ~/src
 cd ~/src
 

setup-ratpoison.sh

@@ -2,10 +2,11 @@
 # Ratpoison setup
 
 # Install dependencies
-sudo apt-get install xcompmgr gcc make xorg xorg
+sudo apt-get install xcompmgr gcc make xorg xorg zx-utils
 # xcompmgr - required for transparency config
 # gcc make -  required for compilation
 # xorg xorg-dev - required for X dependencies
+# zx-utils - required by tar gz
 
 # Download source
 mkdir -p ~/src

setup-vmtools.sh

@@ -3,7 +3,8 @@
 # Good if X is installed earlier!!
 
 # Install dependencies
-sudo apt-get install gcc make linux-headers-$(uname -r) 
+sudo apt-get install gcc make linux-headers-$(uname -r) zx-utils
+# zx-utils - required by tar gz
 
 # sudo mkdir /mnt/cdrom
 # sudo mount /dev/cdrom /mnt/cdrom