Added README.developers to EXTRA_DIST, such that it gets distributed in the tarball.
Added README.developers to EXTRA_DIST, such that it gets distributed in the
tarball.

svn path=/trunk/; revision=5965

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