Now set default number of digits in numeric labels for axis to be switched to scientific notation.  Before this capability had to be enabled by the user.  The number of digits defaults to x:4, y:4, z:3 (xy or xyz plots).
Now set default number of digits in numeric labels for axis to be switched
to scientific notation.  Before this capability had to be enabled by the
user.  The number of digits defaults to x:4, y:4, z:3 (xy or xyz plots).

svn path=/trunk/; revision=673

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