Converted to new PDF function call syntax.  Substantially changed server startup code -- now can handle a variety of cases including starting plserver on a remote node (via remsh) or plserver already existing and only needing to be contacted.  Rewrote data channel code to use socket when DP driver is used.
Converted to new PDF function call syntax.  Substantially changed server
startup code -- now can handle a variety of cases including starting
plserver on a remote node (via remsh) or plserver already existing and
only needing to be contacted.  Rewrote data channel code to use socket
when DP driver is used.

svn path=/trunk/; revision=661

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