Now autoloads the directory TCL_DIR for PLplot Tcl scripts.
Now autoloads the directory TCL_DIR for PLplot Tcl scripts.

svn path=/trunk/; revision=917

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