Add Xfce to Scientific Linux

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1. Download epel repo rpm from http://fedoraproject.org/wiki/EPEL;

2. rpm -ivh epel-release-6.8.noarch.rpm;

3. verify: yum -v repolist, you can see a 'epel' in "repo id" column;

4. yum groupinstall xfce

5. logout and you can see "xfce seesion" on the bottom of the login screen.

You can still use konsle as default termianl.

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