2017/06/24:  Pietro Coretto  <pcoretto@unisa.it>
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   * v 1.0
   * Old approximate EM algorithm replaced with ECM algorithm of Coretto and Hennig 
     proposed in <https://arxiv.org/abs/1309.6895>
   * Parallelization introduced in otrimle()
   * Added CITATION file with updated references
 
 
