Added pls->server_nokill, which can be set to prevent plserver from dying when a ^C is hit.
Added pls->server_nokill, which can be set to prevent plserver from dying
when a ^C is hit.

svn path=/trunk/; revision=1158

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