Accidently also checked in Hez's arc additions to the cairo driver. This commit hopefully removes these additions.
Accidently also checked in Hez's arc additions to the cairo driver. This commit hopefully removes these additions.

svn path=/trunk/; revision=10054

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot