simMixMerlin :Added the option to give a seed. Changed "merlin.freq" to "_merlin.freq","merlin.map" to "_merlin.map","merlin.dat" to "_merlin.dat".
pvalue.machine: updated help file

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/euromix@42 edb9625f-4e0d-4859-8d74-9fd3b1da38cb