Robustified send commands for when interpreter name has embedded blanks (as occurs when the same application is started several times, each creating its own main window).
Robustified send commands for when interpreter name has embedded blanks
(as occurs when the same application is started several times, each
creating its own main window).

svn path=/trunk/; revision=669

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