Add documentation for the plsmema() function. Tweak documentation for the plsmem() function.
Add documentation for the plsmema() function. Tweak documentation for the plsmem() function.

svn path=/trunk/; revision=11199

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