Use plP_script_scale method to replace idiosyncratic method of determining superscript/subscript font sizes and offsets.  The test_superscript_subscript.py results are much improved by this change.
Use plP_script_scale method to replace idiosyncratic method of
determining superscript/subscript font sizes and offsets.  The
test_superscript_subscript.py results are much improved by this
change.


svn path=/trunk/; revision=11792

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