Moved the key_filter proc to plwidget.tcl, since it is better put there. Some cleaning up also.
Moved the key_filter proc to plwidget.tcl, since it is better put there.
Some cleaning up also.

svn path=/trunk/; revision=956

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