Some space pruning on Xfce spin

[Kevin Fenzi]

Greetings. 

I did a bit of pruning today on the Xfce spin, as it had gotten way way
over sized. 

+-adobe-source-han-* # save 94MB
+-rodent-icon-theme  # save 34MB
+-skkdic             # save 25MB
+-naver-nanum-gothic-fonts # save 14MB

I also remove liferea from the comps group (this pulled in webkitgtk3
and should save us a good bit of room)

I also added evince (we had no pdf reader and it was pretty small) and
gvfs-archive. 

I suspect we will still be over, but we can see tomorrow how much and
see what we might be able to further adjust. 

kevin
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