Change plexit() message from "plGetDev" to "plSelectDev", as this is now the correct name.
Change plexit() message from "plGetDev" to "plSelectDev", as this is now the correct name.

svn path=/trunk/; revision=4008

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