Added EM.verbose option to PoisMixClus and PoisMixClusWrapper

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/htsfilter@73 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
- Added dependency for poisson.glm.mix for mylogLikePoisMix function
- Vignette template created
Updates requested by Marie-Laure: default norm in nullModelLogLike changed
to "TMM", informative output about EM algorithm

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/htsfilter@74 edb9625f-4e0d-4859-8d74-9fd3b1da38cb