[arch-general] virtualbox additions package naming

[Ionut Biru]

I've been criticized a lot because I choose poorly the name for guest 
additions.

Right now the packages are like this:
virtualbox-addtitions - contains the iso with guest additions for 
linux/windows/etc and is installed on host
virtualbox-guest-additions - contains guest additions only for an arch 
linux system as guest.
virtualbo-guest-modules - modules only for an arch linux system as guest.

Now that virtualbox 4.1 is released I need help choosing this names.


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Ionuț