By default do not build the doxygen documentation because that latency would be annoying for developers who are just changing one file in the source tree.
By default do not build the doxygen documentation because that latency
would be annoying for developers who are just changing one file in
the source tree.

svn path=/trunk/; revision=11646

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