Added previously missing class selectors cs1-cs7 plaus VA (voice-admit)

Definitely requires my patches to the kernel patches to work (dscp.RELENG_*.diff). OTOH, it is currently broken anyway, so wahtever happens, it cannot get more broken. ;-)

Reasons for inclusion of the missing classes into filter.inc (and not the kernel): 

1. I wanted to keep kernel changes to a minimum.
2. This approach provides a clear point if users need to add their own DSCPs. Yup, two of the DSCP pools are reserved for experimental and internal use...didn't want to add 'em all (2*16 DSCPs) to the list. 

http://forum.pfsense.org/index.php/topic,63580.0.html